O'rourke 

New, fast, cool, and chosen by director Robert Rodriguez, whose other sons are Rebel, Rocket, and Rogue, all somewhat risky options. 

Lara Bingle and Sam Worthington are also parents to sons named Racer and Rocket.

Racer

Jaunty and raffish, Rafferty is one of the most engaging of the Irish surnames, used by Jude Law and Sadie Frost for their son. Fortunately, it doesn't still go by its original form: O'Raighbheartaigh.
 Raff and Rafe are two equally great nicknames.

Rafferty

Randall

This is the second most common boys' version of this attractive name, after the Welsh original Rhys. Reese takes the lead on the girls' side. thanks to the famous Ms. Witherspoon.

Reece

Remington Steele was the perfect name for an upper-crust action hero on 1980s television. Now, Remington is catching fire along with a new generation of predatory baby <a href="https://nameberry.com/boys-names">boy names</a> such as Hunter, Gunner, and Colt. Or you might consider it a <a href="https://nameberry.com/unisex-names">unisex name</a>with a buttoned-up British feel and the friendly short form Rem or Remy.

Remington

Rhett has been more tied to Gone with the Wind than even Scarlett, but now we're hearing rumblings of its finding new and independent favor among parents, perhaps emboldened by the growing popularity of Scarlett. 
 In addition to being a powerful storyteller, author Margaret Mitchell was a great character namer as well—think Scarlett, Melanie, Ashley, and even the mansion Tara. Rhett emerged from the story as one of the ultimate dashing, romantic names—so much so that parents of the past didn't fully embrace it.
 Rhett is a South Carolina surname, brought to North America in 1694, and borne by a noted politician during the Civil War period, which may have inspired the author.

Rhett

This is a name we've seen the potential of for some time now — A Greek island and a prestigious scholarship make for a preppy first name with the uber-stylish S ending. Needless to say we were not surprised that Rhodes cracked the Top 1000 in 2022, and we expect it to keep rising. Rhodes was recently chosen by actress Emma Roberts for her son, born in 2020.

Rhodes

Robert was derived from the ancient Germanic name Hrodebert, from the elements hrod, meaning "fame" and bertha, "bright." Robert was the name of three kings of Scotland, including Robert the Bruce, who freed Scotland from English rule. The name was brought to England by the Normans.

 
Robert was Number 1 in both 1925 and 1950, and in fact was in the Top 25 for an entire century, giving it true classic status. Though no longer stylish, Robert is still widely used as a family name and is one of the premier <a href="https://nameberry.com/search/boys-names/r">boys' names starting with R</a>. 

 Nicknames Bob and Bobby are also stuck in the past, while Rob, Robb and Robby/Robbie have an ever so slightly more modern appeal. Even the antiquated pet forms Dob, Hob, Rab and Rabbie now sound fresher.

 There are countless literary and real-life namesakes, from poets Frost and Burns to actors Redford and De Niro. Modern parents might consider honoring an ancestral Robert by choosing Robertson or Robinson.

Robert

Now that it's no longer fashionable for girls, Robin is rising for boys again. Robin Hood, Robin Williams, Christopher Robin, and Robin the Boy Wonder are all male namesakes, after all. It reentered the US Top 1000 <a href="https://nameberry.com/boys-names">boys names</a> in 2015 for the first time since 1999 and continues to bounce around the lower end of the Top 1000.

Robin is one of the unisex names that switched predominant genders a couple of times. Initially a boys' name, it hit its high point for both genders in the 1950s, eventually becoming more popular for girls. Now Robin is used near-equally for both sexes, given to 290 baby girls and 256 baby boys in the US in 2021.

Robin is one of the <a href="https://nameberry.com/popular-names/france">Top 100 Boy Names in France</a>.

Robin

How many decades will it take for Rocky to triumph over its association with Sylvester Stallone's battered but not beaten boxer? The moment may have come, now that Sarah Michelle Gellar and Freddie Prinze Jr. have named their son Rocky. It helps, too, that Madonna's son Rocco helped make the name child-appropriate again.

Rocky

Roman is an ancient name trending in a major way. A surprise hit name of recent years, Roman now ranks in the Top 100 not only in the US but throughout the English-speaking world, and is rising in other European countries as well.
 
Roman owes much of its current popularity to celebrity and pop culture references. It's the name of the youngest son, played by Kieran Culkin, in the TV show Succession. Roman was used for their sons by Cate Blanchett, Debra Messing, and Molly Ringwald.
 Well known Romans include disgraced director Polanski (born Raimund), Polish photographer Vishniac, and onetime star quarterback Gabriel. Francis Ford Coppola has a son named Roman, who is a director now himself.
 Several relatives of Roman are also newly stylish, from Romy to Romilly to Romeo. Definitely a romantic name, however you use it. 
 The French version is Romaine -- and literary parents might appreciate the fact that 'roman' is the French word for novel.

Roman

Given that Rome is arguably the most important city in European history, it has been used as a first name remarkably little. However, Roman is now in the Top 100, so it was only a matter of time before parents started looking toward the city's actual name.
Over 300 baby boys were named Rome in the US in 2021, about ten times as many as the baby girls named Rome. The name hopped back on the boys' Top 1000 in 2019 after an absence of 120 years, and now seems to be headed straight up the charts.

Rome

It wasn't so long ago that Romeo was considered as outre for an American baby as Casanova or Cupid. But that really changed when David and Victoria Beckham chose it for their second son in 2002, a path followed by Jon Bon Jovi.
 Romeo was not invented by the Bard, but was taken from his source material for the play.
Some sources say it descends from that of Romulus, one of the twin sons of Mars.

Romeo

This spirited Gaelic classic, which became popular in Ireland via the illustrious twelfth century king Rory O'Connor, makes a highly energetic choice, now used for either sex. Rory's gender split is still trending boyward; it's one of the coolest <a href="https://nameberry.com/search/boys-names/r">boys' names starting with R</a>. 
 In England and Wales, however, the name is virtually never given to girls. It's seen as thoroughly male (and non-female) as Roger or Richard.
 Rory first came to attention in the US in the person of mid-century pin-up boy Rory Calhoun (born Francis Timothy). The name entered the popularity list in 1947, peaking at Number 280 in 1959. 
 Young Irish U.S. Open champ Rory Mcllroy makes a worthy namesake. Bill and Melinda Gates chose Rory as the name of their only son.
 Rory is a popular choice all throughout the UK. Skip baffling Gaelic spellings like Ruari and Ruaidhri and stick with the more straightforward Rory.

Rory

Fairly popular a hundred years ago but out of sight now, the quirky Roscoe deserves a place on every adventurous baby-namer's long list. It joins Rufus, Roman, Remy, Romulus, and Ray as one of the R names that sound fresh again after too many years of Robert, Richard, and Ronald.
Originally a place and surname, Roscoe had its glory days in the 1880s, when it reached as high as Number 138, then gradually declined, possibly damaged by the scandals surrounding silent star Roscoe "Fatty" Arbuckle, and then the hillbilly image it acquired thanks to Sheriff Coltrane on The Dukes of Hazzard. 
Roscoe has been out of the Top 1000 since 1978 but feels very much in step with the trending o-ending boy names popular now, such as Milo, Hugo, and Otto.
Trivia tidbit: The R in Edward R. Murrow stands for Roscoe; the distinguished newsman's first name was really Egbert.

Roscoe

Even less subtle than Duke or Earl, this name shot up the popularity charts in 2013, the same year young Prince George was born and the craze for all things royal (and Royal) began. Today, it's a leading boys' name on Nameberry's own popularity charts.

While Royal ranks on the US Top 1000 list for both girls and boys, It's rising precipitously for boys but softening for girls. There are currently nearly three times as many boy babies named Royal as girls..

Pop culture references: the hit Lorde song "Royals.", the Wes Anderson film The Royal Tenenbaums (in which the paterfamilias was named Royal), and most recently, the Amazon Prime series Outer Range, a supernatural neo-Western starring Josh Brolin as Royal Abbott.

The name's resemblance to the more classic Roy doesn't hurt either.

Royal

Rufus is a rumpled, redheaded (it was the nickname for red-haired King William) ancient Roman name popular with saints and singers (e.g. Rufus Wainwright); now, Rufus is on the cutting edge of cool.
 Fellow singer James Taylor named one of his twins Rufus, and Rufus Humphrey is a Gossip Girl character. Rufus Sewell is a commanding, intense English actor.
 Rufus is mentioned in the New Testament as the name of a son of Simon the Cytherian, and there are several St. Rufuses. He's also a major figure in the George Eliot novel Felix Holt: The Radical, an honest and passionate preacher and politician.

Rufus

Ryan’s use as a given name was inspired by the surname Ryan, a variation of the Irish O’Riain meaning "son of Rían." Rían is composed of the Irish-Gaelic elements rí, meaning "king" and an, a diminutive suffix. Ryan is considered a unisex name in the US, where variant spellings Ryann and Ryanne are also valid for girls.
 
Ryan has been one of the most popular <a href="https://nameberry.com/baby-names/168/irish-names">Irish names</a> in America for decades; it had been in the Top 20 since 1976, and dropped out in 2010 but still ranks highly, even though parents now have such a wide choice of Irish surnames, from Flynn to Finnigan, and newer Ry names like Ryder. Ryan (born Patrick) O'Neal first brought it to light in the mid-1960s, when parents saw it as a fresher and more spirited alternative to names like Brian and Kevin. In recent years, Ryan has taken off as a girl's name.
 Several male marquee Ryans still keep the name in the spotlight—think Ryan Seacrest, Ryan Reynolds, Ryan Gosling and Ryan Philippe.

Ryan

As a stylish name, Ryker has three big things going for it: its Ry beginning (as in Riley, Ryder, and Rylan), its two-syllable rhythm, and its er ending. A nice surprise for many is it's "rich" meaning. While this may not be a factor beyond New York City, there is an infamous prison there called Riker's Island. Ryker is one of the trendiest <a href="https://nameberry.com/baby-names/494/german-names-for-boys">German names for boys</a> in the US.

Ryker

Rascal

Russet

FantasyandPrayer's list "R is for Really great boys names" of 22 great name ideas: O'rourke  - Russet!

R is for Really great boys names

I'm having a massive crush on boys names beginning with R at the moment, so why not write them all down together?