Where does “[[mātrimōnium]] [[ad]] [[morganaticus” come from?

[[mātrimōnium]] [[ad]] [[morganaticus (Late 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 “[[mātrimōnium]] [[ad]] [[morganaticus”, 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
Every word from Proto-Indo-European mer-Every word from Proto-Indo-European merkʷ-Every word from Proto-Germanic *murginaz