Where does “matrimonium ad morganaticam” come from?

matrimonium ad morganaticam (Latin) comes 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 “matrimonium ad morganaticam”, step by step

StepLanguageWordMeaning
1Proto-Germanic*murgnagebōmorning gift
2Proto-Germanic*murginaz
3Proto-Indo-Europeanmerkʷ-dark; to blink, twinkle; to flicker, twinkle,...
4Proto-Indo-Europeanmer-to die; to disappear; sea, lake, wetland

Words derived from “matrimonium ad morganaticam

Every word from Proto-Indo-European mer-Every word from Proto-Indo-European merkʷ-Every word from Proto-Germanic *murginaz