I have had occasion to look real close at ππππ΅π, and I get why π[DIGΜIR] is there, and ππ΅π [BILβ.GA.MESΜ] are clearly phonetic components---but what the hell is π [GISΜ] doing there? it's not pronounced (evidently), but as a determiner it doesn't seem to make much sense to me (used for wooden objects and trees), and πππ΅ [(GISΜ) BILβ.GA] as "male ancestor" with a determiner for wooden objects/trees *haunts* me, but I can't find a source for that. What's going on with π in this name?
You know, I can't find a good source on why π appears in this name, as I don't think scholars agree on why it's there. The most common theory seems to be that the bilga element may derive from pabilga πΊππ΅ "paternal grandfather, paternal uncle". Halloran lists bilga as being "a plant-breeder's terminology for a human ancestor", as pa πΊ has "branch" as its most basic meaning, like the branch of a family tree. Somewhere along the line, the πΊ sign of (pa)bilga got reinterpreted as the similar-looking π (and related meaning, branch > tree), and thus got stuck in the name of Bilgamesh and presumably others derived from the same root.
However, not all sources agree on pabilga as being a proven etymology for bilga at all, so take all this with a grain of salt. And check out this prior post on the meaning of Gilgamesh's name.











