Where does “ヘルシンキ” come from?

ヘルシンキ (Japanese) comes from Finnish Helsinki, from Swedish Helsingfors — Helsinki.

Ancestry of “ヘルシンキ”, step by step

StepLanguageWordMeaning
1FinnishHelsinki
2SwedishHelsingforsHelsinki
Every word from Swedish HelsingforsEvery word from Finnish Helsinki
ヘルシンキ — Etymology, Origin & Word History | Etymology Explorer