The story
- Proto-Afroasiatic*dam-
- Proto-Semitic*dam-
- Arabicدَم (dam)
- Swahilidam
- English todayDamu
Borrowed from Swahili damu (“blood”), borrowed from Arabic دَم (dam, “blood”), from Proto-Semitic *dam-, from Proto-Afroasiatic *dam-.
Etymology from Wiktionary, CC BY-SA 4.0.