Where does “Тиса” come from?

Тиса (Ukrainian) comes from Hungarian tisza, from Proto-Slavic tisъ, from Proto-Indo-European taḱs-.

Ancestry of “Тиса”, step by step

StepLanguageWordMeaning
1Hungariantiszayew
2Proto-Slavictisъyew
3Proto-Indo-Europeantaḱs-—
Every word from Proto-Indo-European taḱs- →Every word from Proto-Slavic tisъ →Every word from Hungarian tisza →