Morn
Old English morgen, of Germanic origin.
wiktionary
From Middle English morn, variant of morwe, from Old English morgen, from Proto-West Germanic *morgan, *morgin, from Proto-Germanic *murganaz, *murginaz (compare West Frisian moarn, Low German Morgen, Dutch morgen, German Morgen, Danish morgen, Norwegian morgon), from Proto-Indo-European *mr̥kéno, *mr̥kóno, from Proto-Indo-European *mr̥Hko (compare Welsh bore(“morning”), Lithuanian mérkti(“to blink, twinkle”), Sanskrit मरीचि(márīci, “ray of light”)), from *mer-(“to shimmer, glisten”) (compare Greek μέρα(méra, “morning”)). Doublet of morgen. See also morrow, morning.
etymonline
morn (n.)
"the first part of the day, the morning," late 14c., contracted from Middle English morwen, morghen, from Old English (Mercian) margen (dative marne), earlier morgen (dative morgne) "morning, forenoon, sunrise," from Proto-Germanic *murgana- "morning" (source also of Old Saxon morgan, Old Frisian morgen, Middle Dutch morghen, Dutch morgen, Old High German morgan, German Morgen, Gothic maurgins), from PIE *merk-, perhaps from root *mer- "to blink, twinkle" (source of Lithuanian mirgėti "to blink"). By late 19c. relegated to poetry.
