Alfonso \a-lfon-so, al-fo-nso\ as a boy's name is pronounced al-FON-so. It is of Italian and Spanish origin. Variant of Alphonse (Old German) "ready for battle". Alfonso has been favoured by Spanish royalty, but is seldom used in America. Alphonse is also a French form.

Alfonso has 18 variant forms: Affonso, Alfons, Alfonse, Alfonsin, Alfonsino, Alfonz, Alfonzo, Alonso, Alonzo, Alphons, Alphonse, Alphonso, Alphonsus, Alphonz, Foncho, Fonz, Fonzie and Fonzo.

For more information, see also the related name Fonso.

Baby names that sound like Alfonso are Alfonsus, Alphonzo and Alfonzus.