Alonzo is dashing and debonair, with a large measure of Latin flair.

Cesar is the sleeker version of Caesar, as in emperor Julius, used in the US most frequently by Hispanic parents who put the emphasis on the second syllable. With ancient Roman names back in vogue, Cesar might become more popular.

Colombia is a South American country name, with a rhythmic sound and peaceful connotations. The Irish Colm, Scottish Callum, and Columba are all attractive relatives of Colombia (or Columbia, if you're thinking of the college).