Where does “Väistö” come from?

Väistö (Finnish) comes from Finnish aisti, from Finnish haisti, from Finnish haistaa, from Proto-Finnic haistadak — to smell.

Ancestry of “Väistö”, step by step

Väistö traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Finnish	aisti	sense; Third-person singular indicative past form...
2	Finnish	haisti	olfaction; the sense of smell
3	Finnish	haistaa	to sniff, smell; to scent, smell/nose out, get...
4	Proto-Finnic	haistadak	to smell

Step	Language	Word	Meaning
1	Finnish	väistää	to give way; to avoid; to evade
2	Finnish	-istaa	-ize/-ise; Occasionally used for other purposes,...