Where does “Butterblümchen” come from?

Butterblümchen (German) comes from German Butterblume, from German butter, from Middle High German buter, from Old High German butira, from Proto-West Germanic buterā, from Latin būtȳrum, from Ancient Greek βούτυρον, from Ancient Greek τυρός — to swell; to crowd; to be strong.

Ancestry of “Butterblümchen”, step by step

StepLanguageWordMeaning
1GermanButterblumebuttercup
2Germanbutterinflection of buttern: ## first-person singular...
3Middle High Germanbuterbutter
4Old High Germanbutirabutter
5Proto-West Germanicbuterābutter
6Latinbūtȳrumbutter
7Ancient Greekβούτυρονbutter
8Ancient Greekτυρόςcheese
9Proto-Hellenictūróscheese
10Proto-Indo-Europeantuh₂-ró-s
11Proto-Indo-Europeantewh₂-to swell; to crowd; to be strong
Every word from Proto-Indo-European tewh₂-