insŭlānus, a, um, adj. [insula],
of or belonging to an island : preces, offered by islanders , Sid. Ep. 9, 3; Pacat. Pan. Theod. 23, 3.—Hence, subst.: insŭlānus , i, m., an islander , Cic. N. D. 3, 18, 45.
īnsulānus ī, m insula, an islander . ...
An Elementary Latin Dictionary