Very popular on its native turf, foreign-sounding here.

Excellent candidate for use as an undiscovered surname name. Niven is the Anglicized spelling of the Irish name Naomhan, a diminutive of the word naomh which means saint. This handsome but unusual name was given to only six boys in the US last year. Your parents may be familiar with actor David Niven.

Other forms of the name include Nevan and Nevin.

Attractive, approachable, and more striking Nick alternative.

Often used in England, but here likely to be confused with the feminine Nicole. Nicol Williamson was a Scottish-born actor once described by playwright John Osborne as "the greatest actor since Marlon Brando".

Jarvis, one of the original two-syllable nouveau boys' choices, is a saint's name with a certain retro charm and a nice quirky feel. Though Jarvis peaked in the late 1880s, he is beginning to sound fresh again.

Nicandro might be of interest as a blend of two Anglo favorites -- Nicholas and Andrew.

Sharing an etymology with Cleopatra, this masculine form of the name also has biblical ties. Cleopas was one of the men who encountered Jesus on the road to Emmaus following his resurrection. As a child's name, it has been a rare sight. While it does have an interesting history, it's connection to Cleopatra and obvious nickname Cleo could make it seem too feminine for some.

A Greek classic.

If you're looking for a Nicholas substitute or namesake, Nicholson would make a more distinctive path to the likable nickname Nick, fitting in with other newer patronymics like Anderson and Harrison. Unusual but not outlandish, it is associated with writer Nicholson Baker, library advocate and author of Vox. And as a surname, of course, with Jack.

Dashing and highly unusual variation does the feminine original one better by sounding both more modern and more usable. Or you can spell it Monaco and call it a place name.