A short and sweet Spanish and Portuguese name, meaning "sun". Sol has been used on its own for centuries (it belongs to one of the daughters in the 10th-11th century Spanish epic poem "El Cantar de mio Cid"), and it is also found as a short form of the Marian names María del Sol and María de la Soledad, and of the related names Marisol and Soledad. A famous bearer is Argentine TV presenter (María) Sol Perez.

This nouveau name of Keanu Reeves's character in The Matrix has not enjoyed the same burst of popularity as its female counterpart, Trinity, but it definitely sounds, well, newer. Neo Rauch is an interesting contemporary German artist.

Ara is a unique boys' name that one of the most melodious in the Armenian name pool, familiarized by Notre Dame football coach Ara Parseghian. In Armenian mythology, Ara was a king so handsome that a rival queen went to war in order to make him her own. The name Ara is also known in the Arabic and Hebrew cultures.

Often stands alone in Israel, but rarely here.

The name Jo still evokes the spunky image of the character in Louisa May Alcott's Little Women. Its literary status makes Jo one of the OG boyish nicknames for girls, ala Frankie, Billie, and Stevie. If you like that form, you can lengthen it to Joey.

Io may be one of the slightest names in the book, but there aren't many two-letter names with as much substance as this Greek mythological example. Io, a name used for the largest moon of Jupiter, was in classic myth raped by Zeus and escaped from him by changing herself into a cow.

Kim was the coolest name... of the 1960s. Kim was popularized by actress Kim Novak, and its energy is still maintained by rapper Lil' Kim, but it holds lil' or no appeal for new babies. Parents who like Kim's short, sweet sound might look to a choice such as Sam, Lou, or Belle.

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.

Sid originated as a nickname for Sidney, but we like it on its own, a la Sara Quin's and Jason Biggs and Jenny Mollen's sons. Sid Vicious, member of the band the Sex Pistols, gives this name a punk rock vibe.

Ula is among the unusual U names that may have a range of origins and meanings, from the Celtic one given here to its possibilities as a short form of Eulalia or Ursula. Ulla is a Scandinavian name usually an abbreviation of Ursula or Ulrika.

Kay, a cigarette-smoking, nightclubbing name of the 1930's, could be ready for a comeback along with cousins May/Mae and Ray/Rae.

The most minimalist of names, Ed is decidedly out -- though that usually means it's due to swing back in. More stylish these days: Ned or even Ted.

A river (in Italy), a writer (Bronson), a Teletubby: the Bo of the new millennium.

We've seen Beatrice and Beatrix climb in popularity, along with traditional nickname Bea. And now there's Bee, giving it a buzzy nature world spin, plus a tie to popular late night TV''s Samantha Bee, not to mention Aunt Bee on the old The Andy Griffith Show TV show. Bee can theoretically be short for any girl names starting with B.

Short but spirited, Pim is in the Top 200 in The Netherlands, though it is little-known elsewhere. A diminutive of Willem (or William), it possibly emerged via its rhyme with alternative, more direct short form, Wim.

This name, more recognized as a short form of Sebastian, is perfectly usable a cool full name, and, in fact, ranks on the UK popularity list. Seb is getting lot of attention as the nickname name of the Ryan Gosling character in the hit film La La Land.

Guns 'n' Roses musician Axl (born William) Rose created this name by dropping a vowel, a la Barbra Streisand. The traditional Axel is more popular, though celebrity parents Fergie and Josh Duhamel deliberately chose the Axl spelling to honor her rock hero.

Jen is a short, crisp feminine name that originated primarily as a diminutive of Jennifer, though it can also be a nickname for names like Jenna, Jenny, or Genevieve. The root name Jennifer comes from the Welsh 'Gwenhwyfar,' meaning 'white wave' or 'fair spirit.' Jen gained independent usage during the 1970s and 1980s when Jennifer was at peak popularity, with some parents choosing to put just 'Jen' on the birth certificate. Its simplicity and directness appeal to those preferring unpretentious, straightforward names. While Jen's popularity as a stand-alone name has declined since the 1990s, it maintains appeal for its brevity and friendly, approachable quality. The name carries a casual confidence and remains recognizable without being overly common as a formal name.

Tim is a boyish short form occasionally given on its own. There were 37 baby boys named Tim in the US last year, versus over 1700 named Timothy.

This is one of the ninety-nine attributes of Allah, deemed by Muhammad to be a recommended name for a male child. In this country, it's been primarily associated with boxing immortal Muhammad Ali, known as "the greatest." But Ali is also one of the most popular unisex names for both boys and girls.