Where does “шала́ш” come from?

шала́ш (Russian) comes from Hungarian szállás, from Hungarian -ás — Added to a verb to form a noun.

Ancestry of “шала́ш”, step by step

Step	Language	Word	Meaning
1	Hungarian	szállás	housing, accommodation, living quarters, lodging,...
2	Hungarian	-ás	Added to a verb to form a noun

шала́ш — Etymology, Origin & Word History | Etymology Explorer