Italian names are famously euphonious. The book about Florentine history that I recently reviewed here contained thousands of them. Did I have a favorite? Of course. Clarice Orsini, the wife of Lorenzo the Magnificent. You have to pronounce it in the Italian way though.
Continuing with the theme of cool-sounding word combinations, I learned from Hugh Thomas's first book about the early Spanish empire that Ferdinand of Aragon, Isabella's husband, signed all his letters with the phrase "yo, el rey". That sounds great no matter what language I translate it to.