There are at least two artists using this name:
1) A german Trance producer, full name: Armas C. Lowell (part of Baton & Lowell) 2) An organisation of artists and writers from the Philippines:
ARMAS (Artista at Manunulat ng Sambayanan / Artists and Writers of the People) is the cultural arm of the National Democratic Front of the Philippines (NDFP) which is led by the Communist Party of the Philippines.

Read more about Armas on Last.fm.