Arnaldo \a-rnal-do, ar-na-ldo\ as a boy's name is a variant of Arnaud (French, Italian) and Arnold (Old French, Old German), and the meaning of Arnaldo is "eagle ruler".

The baby name Arnaldo sounds like Arnald and Arnoldo. Other similar baby names are Araldo, Arnauld, Aroldo, Rinaldo, Renaldo and Ronaldo.