Where does “bloo” come from?

bloo (Middle English) comes from Old English blāw, from Proto-West Germanic blāu, from Proto-Germanic blēwaz, from Proto-Indo-European bʰlēw- — yellow, blond, grey.

Ancestry of “bloo”, step by step

StepLanguageWordMeaning
1Old Englishblāwblue
2Proto-West Germanicblāublue
3Proto-Germanicblēwazblue; a dark bluish or grey colour, black
4Proto-Indo-Europeanbʰlēw-yellow, blond, grey
Every word from Proto-Indo-European bʰlēw- →Every word from Proto-Germanic blēwaz →Every word from Proto-West Germanic blāu →