A pretty smoosh name predominantly used by Italian Catholics.

 The meaning of Maria is uncertain, but theories include "drop of the sea" (from Hebrew roots mar "drop" and yam "sea"); "bitter" (from Hebrew marah "bitterness"); and "beloved" (from the Egyptian root mr).

Annamaria

UAITHNE

Uber is as off the table as a baby name as, sadly, Siri and Alexa.

Uber

UDANE

UKALEQ

Ulla, the beautiful Swedish secretary in The Producers (played by Uma Thurman in the movie) who purrs, "Ven you got it, flaunt it," has changed the image of this name forever. Ulla may stand on its own or be an abbreviation of Ursula or Ulrika; Ula may be seen as another spelling.

Ulla

Ullric

An uncommon Latin and Italian name which would make a fitting choice for a final baby – but be aware that many would associate it with the cosmetics brand or the Ultimo brand of lingerie. 

Ultima

ULVİ 

Ulysses is one of the few U boys' names anyone knows -- with heavy links to the Homeric hero, eighteenth president Grant, and the James Joyce novel -- all of which makes it both distinguished and kind of weighty for a modern boy. Ulysses was on the US popularity list well into the twenty-first century; it's off now, but Number 684 on Nameberry.
 Former SNLer Anna Gasteyer made this bold choice for her son, perhaps inspiring others to follow her lead. George Clooney's character name in the Coen brothers' O Brother, Where Art Thou? is Ulysses.
 Trivia tidbit: The presidential bearer was christened Hiram Ulysses Grant, but reputedly was all too happy when his first two names were reversed at West Point, as he had always been embarrassed by having the initials HUG.

Ulysses

Uma is a sweet, strong name for a Hindu goddess... and a Hollywood one. But as popular as Uma Thurman is, other parents have not yet picked up on her name, making it a rarity.
 Uma is one of the more than one thousand appellations for the Hindu goddess Sakti, a fact that surely inspired the father of Ms. Thurman, a Columbia University professor of Eastern religion. Her middle name, Karuna, is equally unknown outside the Indian subcontinent.
 In Hebrew, Uma means "the nation," and is therefore sometimes used for girls born on Israeli Independence Day.
 Uma shouldn't be confused with the similarly sounding Una, an ancient Irish name.

Conjures up the rich brown colors of raw and burnt umber, but it may be too close to girls' Amber. 

Umber

Umbria is a lovely, virtually unused <a href="https://nameberry.com/baby-names/505/italian-names-for-girls">Italian name for girls</a>, reflecting the beautiful rolling hills of the area's countryside. And since it's right next door to Tuscany, in which Siena resides, maybe Umbria could be a follow-up to the popular Siena-Sienna.

Umbria

In an epic poem, the personification of truth, beauty, and unity; this ancient name is popular in several European countries but less common in the US. The Oona spelling is slightly more popular but Una sleeker.

UNATHI

Mythological water spirit with the more common spelling of Ondine, heroine of an Edith Wharton novel. 

Undine

Unice

Like Verity and Amity, this inclusive virtue name used by the colorful British literary Mitford family is ready to join its more popular peers Hope, Faith, and Grace. 
 The name was embraced by the Puritans in the seventeenth century, but was not as common as others. In literature it occurs as a servant in Thomas Hardy's A Pair of Blue Eyes.
 Unity Valkyrie Mitford supposedly inspired the character of Bellatrix Lestrange in J. K. Rowling's Harry Potter series. Unity Kincaid is a character In the Sandman series by Neil Gaiman.

Unity

UNNUR 

UPASANA

Uppity name associated with muckraking novelist Upton Sinclair.

Upton

The name of one of the Greek Muses would be really difficult to bear here on earth. 

Urania

Urban was not an uncommon name through the 1930s (rising as high as Number 435), having been attached to several saints and early popes, but it has completely disappeared from the landscape--both urban and rural. Yet in this era of word name appreciation and trend for 'an'-ending boys' names, we're thinking it might be ready for a return.
 In the New Testament, Urban is an active member of the Christian church in Rome.
 Urbano is the commonly heard Italian version, and the French Urbain was used by Henry James for an--yes--urbane character in The American.
 These days, the name is associated with musician Keith Urban.

Urban

URHO

A perfectly respectable Old Testament name ruined forever through its association with the odious Uriah Heep in David Copperfield. Some people also find this name just too close to the word urine. These negative connotations may be wearing off, however. (Perhaps because people don't read as much Dickens as they used to.)

Uriah

It's the name of an Old Testament archangel that's symbolically given to boys born during Chanukah, but the possibility of unsavory nicknames (urinal?) make the short form Uri a better bet. 

Uriel

A saint's name with a noteworthy literary background, including uses by Shakespeare in Two Gentlemen of Verona and Much Ado About Nothing, by Ben Johnson, Walter Scott, Longfellow, D. H. Lawrence and Neil Gaiman. In real life, her two most well known representatives are writer Ursula Le Guin and actress Ursula Andress. In literature, there is also Ursula Iguaran, a key, long-lived character in Gabriel Garcia Marquez's major work, One Hundred Years of Solitude.
 Caveat: Today's kids might associate this name with the campy, corpulent octopus in Disney's The Little Mermaid.
 Ursula ranked in the Top 1000 through 1983. Time for a comeback?

Ursula

USHA

Strongly associated with the mega-popular single-named singer, who was actually the fourth Usher Raymond in his family. He could start a fad.
 
The Yiddish variation of Usher is commonly used in the Hasidic community.

Usher

USOA

This would make a startling but likable choice; poet Dylan Thomas used it for a character in his play "Under Milk Wood." 

Utah

An extra zesty variation of Uzi, but not one that comes recommended — it’s strongly associated with the submachine gun.

Uzzi

Uforia

Ugene

Ulna

Ultra

Umma

Uranus

ubiquity

ulalie

ultraviolet

umbrella

ÜLKÜ

ScarlettRobin's list "Unusual U names" of 45 great name ideas: Annamaria - ÜLKÜ!