Alfonsus \a-lfon-sus, al-fo-nsus\ as a boy's name is a variant of Alphonse (Old German), and the meaning of Alfonsus is "ready for battle".

The baby name Alfonsus sounds like Alfonzus, Alfonso, Alphonsus, Alfonsin, Alfonse and Alfons. Other similar baby names are Alfonzo, Alfonz, Alfonsino and Alphonzus.