Where does “Vietnamistin” come from?

Vietnamistin (German) comes from German Vietnamist, from German -ist, from Latin -ista, from Ancient Greek -ιστής, from Ancient Greek -τής, from Proto-Hellenic -tās.

Ancestry of “Vietnamistin”, step by step

Step	Language	Word	Meaning
1	German	Vietnamist	vietnamist
2	German	-ist	-ist; Also see
3	Latin	-ista	-ist; one who practises or believes
4	Ancient Greek	-ιστής	Alternative form of -τής; -ist
5	Ancient Greek	-τής	Appended to verbs to form agent nouns
6	Proto-Hellenic	-tās	—

Every word from Proto-Hellenic -tās →Every word from Ancient Greek -τής →Every word from Latin -ista →