Where does “břehulka” come from?

břehulka (Czech) comes from Czech břehule, from Czech břeh, from Old Czech břěh, from Proto-Slavic bergъ, from Proto-Balto-Slavic *bérgas, from Proto-Indo-European *bʰérǵʰos, from Proto-Indo-European bʰerǵʰ- — to rise; high, lofty; hill, mountain.

Ancestry of “břehulka”, step by step

StepLanguageWordMeaning
1Czechbřehuleany bird of the genus Riparia
2Czechbřehbank, shore; shore, coast
3Old Czechbřěhhill, elevation
4Proto-Slavicbergъhill; slope, cliff?; bank, shore?, coast?
5Proto-Balto-Slavic*bérgashill
6Proto-Indo-European*bʰérǵʰoshill
7Proto-Indo-Europeanbʰerǵʰ-to rise; high, lofty; hill, mountain
Every word from Proto-Indo-European bʰerǵʰ-Every word from Proto-Indo-European *bʰérǵʰosEvery word from Proto-Balto-Slavic *bérgas