Ad-Din
Ad-Din (Arabic: الْدِّين ad-dīn [ædˈdiːn], "(of) the religion/faith/creed") is a suffix component of some Arabic names in the construct case, meaning 'the religion/faith/creed', e.g. Saif ad-Din (Arabic: سيف الدّين Sayf ad-Dīn, "Sword of the Faith").