Arnau \a-rnau, ar-nau\ as a boy's name is a variant of Arnold (Old French, Old German), and the meaning of Arnau is "eagle ruler".

The baby name Arnau sounds like Arnou, Arran, Arnie, Aran, Arian, Arne, Arni, Arney, Arno, Arnow, Arnoux, Arnoe, Arny and Arn. Other similar baby names are Arnan, Arnaud and Arnat.