Where does “morganatyczny” come from?

morganatyczny (Polish) comes from French morganatique, from Latin morganaticus, from Latin matrimonium ad morganaticam, from Proto-Germanic *murgnagebō, from Proto-Germanic *murginaz, from Proto-Indo-European merkʷ-, from Proto-Indo-European mer- — to die; to disappear; sea, lake, wetland.

Ancestry of “morganatyczny”, step by step

StepLanguageWordMeaning
1Frenchmorganatiquemorganatic
2Latinmorganaticus
3Latinmatrimonium ad morganaticam
4Proto-Germanic*murgnagebōmorning gift
5Proto-Germanic*murginaz
6Proto-Indo-Europeanmerkʷ-dark; to blink, twinkle; to flicker, twinkle,...
7Proto-Indo-Europeanmer-to die; to disappear; sea, lake, wetland
Every word from Proto-Indo-European mer-