＞The Emutbal (also attested as Yamutbal) first appears clearly in the historical record
＞during the early Old Babylonian period. While Amorite tribal names are documented in
＞Ur III administrative texts (late third millennium BCE), including forms such as ia-a-ma-tu,
＞ia-a-ma-ti, and ia-a-ma-ti-um (associated with Yahmutum/Yamutum), these are not
＞directly linked to Emutbal/Yamutbal. Such Ur III attestations reflect the broader
＞presence of Amorite elements in Mesopotamia prior to the collapse of the Ur III dynasty.
（※Grokipedia「Emutbal」の項より）
見落とせないのは、ウルⅢ期の行政文書に、「Amorite」（アモリ人）の種族として、
音節表記で「ia-a-ma-tu」に作る名称が出てくる、という指摘だろう。これには驚く。
これは、意味は不明ながら、音形の点に於いて「夜麻登」に当てはまる。要調査だ。