From Proto-West Germanic *balkō (“beam”).
balko m
- beam
- Middle High German: balke
- German: Balken
- → Old Polish: balka, balk
- Polish: belka, bałk, belk, bełk, bełka (Middle Polish), balk, balka, bałek, bałka, belek (obsolete)
- Silesian: bŏlka, balek, balk, belek, bŏlek