Finnish word suru comes from Finnish surra, Finnish -u

Detailed word origin of suru

Dictionary entry	Language	Definition
surra	Finnish (fin)	(intransitive) To mourn, grieve (very often because of someone's death).. (transitive) To mourn, grieve (over someone = partitive; over a dead person).
-u	Finnish (fin)	Derives a number of nouns from other nouns.. Forms nouns from verbs. Most common with e- and i-stem verbs.
suru	Finnish (fin)	Sorrow, grief; woe.

Words with the same origin as suru