What is "deicolus"

Saint Deicolus (Déicole, Dichuil, Deel, Deicola, Deicuil, Delle, Desle, Dichul, Dicuil) (c. 530 – January 18, 625) is venerated as a saint by the Catholic Church and by the Orthodox Church as a pre-Schism Western saint. He was an elder brother of Saint Gall. Born in Leinster, Deicolus studied at Bangor.