Where does “hälytä” come from?

hälytä (Finnish) comes from Finnish häly, from Finnish -u, from Proto-Finnic -u — Forms nouns from adjectives, nouns.

hälytä (Finnish): Alternative form of hälistä; Indicative present...

Definitions

hälytä traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Finnish	häly	noise; unpitched sound
2	Finnish	-u	Forms nouns from verbs. Most common with "e"- and...
3	Proto-Finnic	-u	Forms nouns from adjectives, nouns

Step	Language	Word	Meaning
1	Finnish	tä	what
2	Finnish	mitä	Partitive singular form of mikä; Partitive...