Quirky cool Arlo is now well and truly back. Last year it broke into the US Top 200 boy names and consistently ranks among the most popular boy names on Nameberry. Along with its Irish and English roots, Arlo may be a shortened form of the Italian Carlo or the Spanish Carlos, both forms of Charles,and in Basque-speaking regions it is the word for area.

This quirky British nickname-turned- real-name is most famously borne by English actress Tuppence Middleton, who was named for her mother Tina’s childhood nickname. There is also a British literary namesake in Agatha Christie’s fictional detective Tuppence Beresford, whose real name is Prudence.

Arlo, an unexpectedly popular name for boys these days, is also finding new life as a girls' name. Its roots are primarily as an Irish or English surname, but it might also be a short form of the Spanish Carlos or Italian Carlo, forms of Charles.

Basketball's Jayson Tatum introduced this to the naming lexicon when he used it as a clever nickname for his son, Jayson Christoper Jr. It fits in with nicknames like Trey or Trip for boys who are the third in the family with their name; we've even heard Quatty and Quinto.

Siddhartha Gautama was one of the real names of Buddha, making this an impressive and weighty name among the Buddhist community.

Twain can be thought of as a modernization (and possible namesake) of the dated Wayne, seasoned with the humor of Mark Twain, who adopted it from a river term.