Where does “mummokeinu” come from?

mummokeinu (Finnish) comes from Finnish mummo, from Swedish mormor, from Swedish mör, from Latin maurus, from French maure, from Middle French moré, from Old French More, from Latin Maurus — Creates adjectives from noun or verb stems.

Ancestry of “mummokeinu”, step by step

mummokeinu traces back through two separate lines of ancestry.

via Finnish mummo

Step	Language	Word	Meaning
1	Finnish	mummo	A grandma; An old woman; A "mummonmarkka"
2	Swedish	mormor	maternal grandmother
3	Swedish	mör	tender; very tired, exhausted, ready to go to...
4	Latin	maurus	Moorish, North African
5	French	maure	Moorish
6	Middle French	moré	Moor (person of Berber descent)
7	Old French	More	—
8	Latin	Maurus	Of or pertaining to the Moors; Moorish,...
9	Ancient Greek	Μαυρούσιος	an inhabitant of Mauretania; a Mauretanian
10	Ancient Greek	-ούσιος	forms relational adjectives: of or pertaining to
11	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
12	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

via Finnish keinu

Step	Language	Word	Meaning
1	Finnish	keinu	A swing
2	Finnish	-u	Forms nouns from verbs. Most common with "e"- and...
3	Proto-Finnic	-u	Forms nouns from adjectives, nouns

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek -ούσιος →