Where does “múlja” come from?

múlja (Hungarian) comes from Hungarian múlik, from Proto-Finno-Ugric mule- — to go by, pass.

Ancestry of “múlja”, step by step

Step	Language	Word	Meaning
1	Hungarian	múlik	to pass, to go by, to elapse; to be past; to...
2	Proto-Finno-Ugric	mule-	to go by, pass