Where does “Sălnița” come from?

Sălnița (Romanian) comes from Latvian salna, from Proto-Indo-European *sḗh₂l — salt.

Ancestry of “Sălnița”, step by step

Step	Language	Word	Meaning
1	Latvian	salna	light frost, especially in spring or winter, with...
2	Proto-Indo-European	*sḗh₂l	salt