Where does “bronleision” come from?

bronleision (Welsh) comes from Welsh bronlas, from Welsh glas, from English glass, from Scottish Gaelic glas, from Middle Irish glas, from Old Irish glas, from Proto-Celtic glastos, from Proto-Indo-European ǵʰl̥h₃stós — to flourish; green, yellow.

Ancestry of “bronleision”, step by step

StepLanguageWordMeaning
1Welshbronlasbluethroat, (Luscinia svecica)
2Welshglasblue
3EnglishglassAn amorphous solid, often transparent substance...
4Scottish Gaelicglasgreen; grey; lock
5Middle Irishglas
6Old Irishglasgreen, greenish; blue, green-blue, grey-blue; the...
7Proto-Celticglastosgreen, blue
8Proto-Indo-Europeanǵʰl̥h₃stós
9Proto-Indo-Europeanǵʰelh₃-to flourish; green, yellow
Every word from Proto-Indo-European ǵʰelh₃-