Where does “Rzehak” come from?

Rzehak (German) comes from Czech Řehák, from Czech Řehoř, from Ancient Greek Γρηγόριος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Rzehak”, step by step

StepLanguageWordMeaning
1CzechŘehák—
2CzechŘehoř—
3Ancient GreekΓρηγόριοςwatchful, vigilant
4Ancient Greek-ῐοςbelonging to; of”, “belonging to”, “pertaining to
5Proto-Indo-European-yósCreates adjectives from noun or verb stems
Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek Γρηγόριος →