Where does “Itamogûaîa” come from?

Itamogûaîa (Old Tupi) comes from Old Tupi -a, from Old Tupi pó, from Proto-Tupi-Guarani *po, from Proto-Tupian *po — hand.

Ancestry of “Itamogûaîa”, step by step

StepLanguageWordMeaning
1Old Tupi-aforms nouns from a word's stem
2Old Tupipóhand
3Proto-Tupi-Guarani*pohand
4Proto-Tupian*pohand
Every word from Proto-Tupian *po →Every word from Old Tupi -a →Every word from Proto-Tupi-Guarani *po →