Alphonsus \a-lphon-sus, al-pho-nsus\ as a boy's name is a variant of Alfonso (Italian, Spanish) and Alphonse (Old German), and the meaning of Alphonsus is "ready for battle".

The baby name Alphonsus sounds like Alphonzus, Alphonso, Alphons and Alfonsus. Other similar baby names are Alphonz, Alphonzo and Alfonzus.