Where does “krabba” come from?

krabba (Swedish) comes from Old Swedish krabba, from Old Norse krabbi, from Old English crabba, from Proto-West Germanic krabbō, from Proto-Germanic krabbô, from Proto-Germanic krabbōną, from Proto-Indo-European gerbʰ-, from Proto-Indo-European ger- — to turn, bend, twist, wind; to tie, bind...

krabba (Swedish): a crab