Semitic languages
The similarity of the Hebrew, Arabic and Aramaic languages was accepted by Jewish and Islamic scholars since medieval times. The languages were familiar to Western European scholars due to historical contact with neighbouring Near Eastern countries and through Biblical studies, and a comparative analysis of Hebrew, Arabic, and Aramaic was published in Latin in 1538 by Guillaume Postel. Almost two centuries later, Hiob Ludolf described the similarities between these three languages and the Ethiopian Semitic languages. However, neither scholar named this grouping as "Semitic".
Arabic definite article
Finally, in some Semitic languages like Hebrew, words that include the letter lāmed have Arabic cognates that replace it with a Mīm as opposed to Lām, the equivalent letter. For example, skull in Hebrew is גֻּלְגֹּלֶת (gulgolet). Its Arabic cognate is جمجمة (jumjúmah). This gives plausibility to the case of Banu Hamīr and indicates that lām is frequently equated with Mīm.