Kolach

Kolach or kalach is a traditional bread found in Central and Eastern European cuisines, commonly served during various special occasions – particularly wedding celebrations, Christmas, Easter, and Dożynki. The name originates from the Old Slavonic word kolo meaning "circle" or "wheel". Korovai is sometimes categorised as a type of kolach. The name slightly varies between countries, but its general meaning originally comes from the Early Slavic root vocabulary that references the circular shape of the bread (Proto-Slavic: *kolačь, derived from "kolo"). Variants of "kolach" (Bulgarian, Macedonian, and Ukrainian: колач, Polish and Silesian: kołocz, Romanian: colac, Serbian: колач / kolač, Slovene: kolač) are the most commonly used forms, but "kalach" (Belarusian, Russian, and Ukrainian: калач, Hungarian: kalács, Polish and Silesian: kołacz) is also widespread. The Albanian: kulaç is cognate with all of these.

Source: Wikipedia