Where does “morganático” come from?
morganático (Spanish) comes 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.
morganático (Spanish): morganatic
Ancestry of “morganático”, step by step