Where does “mono-” come from?

mono- (Swedish) comes from Ancient Greek μόνος, from Ancient Greek σπέρμα, from Proto-Hellenic *spérmə.

Ancestry of “mono-”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	μόνος	alone, forsaken, solitary; only; unique
2	Ancient Greek	σπέρμα	seed; semen, sperm; seed-time, sowing
3	Proto-Hellenic	*spérmə	—

mono- — Etymology, Origin & Word History | Etymology Explorer