Names That Mean Ruler

An unusual diminutive of Harriet, that might work for a girl who doesn't suit Hattie or Hettie, but isn't keen on being Harri either. Ultimately a feminine form of Henry, it means "home ruler".
 
Although Harryo might sound like a modern invention, it was in fact used by the 18th century Duchess of Devonshire, Georgiana Cavendish, for her daughter, Harriet. Two of her other children had equally playful nicknames: "Little G" for Georgiana and "Hart" for William (Marquess of Hartingdon).
 
It may remind some people of the 70s show Harry O or the candy, Haribo, or perhaps the names Harlow, Cleo, and Mylo.

Harryo

The old-school cool nickname Hap is a (mostly) bygone short form of classic H names for boys like Henry, Harold, and Harrison. Several notable Haps — including former New Jersey senator Hap Farley — were first nicknamed Happy, later shortened to Hap.
 
Fictional Haps include Happy "Hap" Loman in Arthur Miller's play Death of a Salesman, Hap Eckhart in Christopher Nolan's film Insomnia, and most recently Harlan "Hap" Briggs in the television series Blood & Oil.
 
Today, Hap is a distinctive choice of nickname to set your Henry apart from the crowd.

A feminine form of the Vladimir, this variation has the same grandeur as its masculine counterpart, but also comes with sweet nicknames Vira and Mira. Blending the elements volděti ("to rule"), měrŭ ("great, famous"), and mirŭ ("peace, world"), it can be interpreted as meaning "great ruler of the world" or "famous, peaceful ruler". 
 
Used in Croatia, Bulgaria, Russia, Czechia, and Slovenia, Lada and Vlada are also used as a short forms.

Vladimira

A clunky yet strong grandpa-name for boys, Harold may seem like an unlikely choice for girls, but it has nevertheless been appearing in the US stats since the 1890s. It's last appearance was in 2004 when six girls received the name, while it was at its peak in 1929, when it was given to 98. Nicknames Haddie, Hallie, Harrie, or Hattie, perhaps?

Harold

A modern form of the Old Norse Ragnvaldr and a relation of Reginald, Renaud, Ronald, and Reynold, Ragnvald is a rugged and strong name used predominantly in Norway and Sweden. Notable bearers include Scandinavian nobleman, Ragnvald Ulfsson the Old,  footballer Ragnvald Soma, and illustrator and editor Ragnvald Blix.

Ragnvald

A rare spin on the classic Ruth, Ruthetta was used occasionally in the early half of the 20th-century. 

Ruthetta

Frederika is one of many feminine variations of the many variations of Frederick, which include Frederica, Friederike, and Frederieke. The name carries an air of nobility and elegance, having been used in royal families throughout European history. 

While never reaching widespread popularity in English-speaking countries, Frederika maintains steady usage in Northern European countries, particularly in Germany and the Netherlands. The name offers several friendly nickname options including Freda, Rika, or Freddie, allowing for versatility as a person grows from childhood into adulthood.

Frederika

An elaborate and less popular form of the unisex Avery, similar in feel to Aviana, Audria, and Aubriella. It is similar, however, to the Spanish avería meaning "fault, breakdown".

Averia

Until recently, Hank was not on the table for baby girls. But with the new generation of girls called Billie, Frankie, and Stevie, it's a fresh possibility.

Hank

Macenry is a rare modern blended name that combines two traditional names, Mac or Mack and Henry. It carries the strength and simplicity of Mack with the timeless charm of Henry. Macenry feels fresh and unique while still rooted in familiar sounds.

Bonus: Mac can be considered an honor name for any ancestor whose surname begins with Mac or Mc, gender immaterial.

Macenry

The chic French form of Frederick, Frédéric was popular in France in the middle of the 20th century. This is famously the French name of composer Frédéric Chopin (born Fryderyk Chopin).

Frédéric

Ali̇xan is a cool and contemporary looking choice, currently popular in Azerbaijan. It combines the Arabic Ali with the Turkic title, Khan, to give the name the powerful meaning of "supreme and exalted leader". 
 
Alixan - without the dotted I - is also the name of a town in South East France, pronounced AH-leek-ohn, with a barely there 'n' in the final syllable. In this case, the name would mean "land of Alexius".

Ali̇xan

Ryś is used as a diminutive of Ryszard, the Polish form of the Germanic Richard. As such Ryś is a Polish equivalent of the English Rick or Rich.
 
While it is tied to the sturdy classic, Ryś also doubles up as a word name, ryś being the Polish word for "lynx". The name is also used as a surname, borne by speedskater and politician Erwina Ryś-Ferens, for example.

Ryś

Fredo is a masculine name that originated as a diminutive form of the Italian names Alfredo or Federico. The name gained cultural recognition through its use in 'The Godfather' novels and films for the tragic character Fredo Corleone, giving it associations with Italian-American culture. 

While not extremely common as a formal given name, Fredo has been used both as a nickname and as a standalone name throughout Italian communities and beyond. The name has a friendly, approachable quality with its short form and ending in 'o,' characteristic of many Italian male names, but your son may not appreciate being named after a less-than-noble character.

Fredo

Rodric

A clunky feminine form of clunky Donald, this name has links to Scottish royalty, Donald Duck, and Donald Trump. Out of the US stats since the 70s, unisex Donnie would be more appealing these days.

Donalda

Strong without sounding harsh, Ewald is an Old Germanic name made up of ewa meaning "law" and walt meaning "power, authority". It therefore translates to "ruler of the law", "power of the law" or "powerful ruler" and was borne by two 7th century saint along with physicist Ewald Georg von Kleist and Olympian Ewald Walch. 
 
Ewoud and Ewout are Dutch variations, while other forms include the Portuguese Evaldo and the Latvian Ēvalds.

Ewald

Americus, the source of the place-name America, became a girls' name thanks to pronatalist activists Malcom and Simone Collins, who patriotically named their second daughter and fourth child Industry Americus.

Americus

A smoosh name, blending modern Aubrey with classic Anna.

Aubreyanna

The Azerbaijani form of the Turkish-Persian name Elmira. It is likely the name is made up of the elements el, meaning "homeland", "nation", or "country" and amir meaning "prince" or "commander". Put together, the name begins to feel bold and powerful.