Finnish word laulu comes from Finnish laulaa ((transitive, intransitive) To sing.), Finnish -u

Detailed word origin of laulu

Dictionary entry	Language	Definition
laulaa	Finnish (fin)	(transitive, intransitive) To sing.
-u	Finnish (fin)	Derives a number of nouns from other nouns.. Forms nouns from verbs. Most common with e- and i-stem verbs.
laulu	Finnish (fin)	Singing. Song.

Words with the same origin as laulu