A name of Spanish origin, the meaning of Arnaldo is ‘eagle power’. The Teutonic meaning of the name Arnaldo is as ‘strong as an eagle’. According to its English origin, the meaning of Arnaldo is ‘ruler’. Arnaldo is a boy's name. Well-known personalities with the name include Arnaldo Otegi who is a Spanish Basque politician, Arnaldo Tamayo Méndez, a Cuban astronaut, Arnaldo Dante Momiglian, an Italian historian, Arnaldo Pomodoro, an Italian sculptor, Arnaldo Calveyra, an Argentine poet, and Arnaldo Augusto Nora Antunes, a Brazilian musician.