The two X's may be a challenge for even the most intrepid baby namer. Xerxes was the name of two early kings of Persia and the Handel opera Serse or Xerxes is loosely based on Xerxes I.

In the World War II era, Roger had nothing but the most positive associations, actually used by military personnel to mean 'Received and understood'--or A-OK, and though it is now on extended furlough, it does have a long and distinguished history. Introduced to England after the Norman Conquest of 1066, Roger soon became very popular there, with nicknames Hodge and Dodge, and had a long run later in the U.S, remaining in the Top 100 for 55 years.

The name Christian has fallen a bit from its 90's and 00's heights, but it's still quite popular. Once considered overly pious, Christian is now seen as making a bold statement of faith by some, while also having secular appeal for others. Christian's enduring popularity may be influenced by such celebrities as Christian Slater and Christian Bale, not to mention the fashion world's Dior, Lacroix, Louboutin and Audigier.

Inigo, almost unknown in the U.S., is an intriguing choice, with its strong beat, creative and evocative sound, and associations with the great early British architect and stage designer Inigo Jones. The sixteenth-seventeenth century Jones shared his name with his father, a London clockmaker, who received it when Spanish names for boys were fashionable in England, especially among devout Roman Catholics.

Marcel, despite distinguished namesakes including Proust and Duchamp, suffers from a terminal headwaiter image in this country. But along with its sister name Marcella and French variation (and Jolie-Pitt pick) Marcheline, Marcel may be on the brink of a style renaissance.

Allen is the spelling of this name -- other common spellings are Alan and Allan -- most associated with the surname; it might also be the most appropriate if you're trying to steer clear of Al as a nickname, as this can easily offer you Len or Lenny as options.

If you're tired of Oliver, you might consider this energetic three-syllable surname instead, so you could have a little Tolly instead of an Ollie.

A spirited German name very popular in Italy and occasionally used here, Aldo is one of the unique baby names with international flair. And names that mean wise have an enduring appeal.

Merritt is an old-style surname name that could be seen as a positive virtue name. It was used in the late 19th and early 20th century for boys, reaching the Top 400 in 1899, and is notable today for being one of the names most evenly divided between boys and girls. Emmy winner Merritt Wever helped popularize it for girls.

Made famous by F. Scott Fitzgerald and John Fitzgerald Kennedy; still works best as a middle name.

Liev Schreiber's birth name is Isaac Liev, Liev after his mother's favorite Russia author, Leo Tolstoy. Though Liev is increasing in popularity in the secular world thanks to the actor, it originated as a Yiddish diminutive.

Kingsley is a sophisticated Harry Potter name that entered the US Top 1000 in 2013.

This variation of Wesley moved into the Top 1000 among boys' names in the US in 2016, perhaps because it makes the name more Western, with the cowboy nickname West., or because parents have taken inspiration from the protagonist of the movie The Princess Bride.

Eleazar is a distinguished Biblical name--in which it appears several times-- ripe for the picking following the stardom of Eli, Elijah, and other similar names.

Gerard is currently in style limbo, after reaching peak popularity in the 1950s. With its strong meaning and gentle sound, it may be back in a generation or two. But for now, a boy called Gerard will likely be the only one in his class...unless you live in Catalonia, where it was recently in the Top 10.