Where does “Tiroli” come from?

Tiroli (Finnish) comes from German Tirol, from Proto-Celtic tīros, from Proto-Indo-European ters- — dry.

Ancestry of “Tiroli”, step by step

StepLanguageWordMeaning
1GermanTirol—
2Proto-Celtictīrosdry land
3Proto-Indo-Europeanters-dry
Every word from Proto-Indo-European ters- →Every word from Proto-Celtic tīros →Every word from German Tirol →