Albright notes that origins of Ham's name are unknown.
William F. Albright, "Review of Hebrew Union College Annual," Journal of Biblical Literature 64, No. 2 (Jun., 1945), 294
The author's final combination of Ham, son of Noah, with *Hammu, and his derivation of the names of the Armenian city of Amedi-Amida and the Syrian Hums-Emesa from *Hammu are somewhat disconcerting but can scarcely be refuted, since even plausible etymologies are wanting.