 His first name is in dispute.Some medieval authorities called him "Jacob"; two Chufut-Kale manuscripts have "Moses b. David"; a third contains his epigraph, which is incomplete, only "ben David ben Naphtali" remaining.His name is most likely Abu Imrān, Moshe Ben David Ben Naphtali as preserved in Mishael Ben Uzziel's 11th century treatise and in the Geniza fragment T-S K27.36 in the University Library at Cambridge.