Where does “sírunkban” come from?

sírunkban (Hungarian) comes from Hungarian sír, from Proto-Finno-Ugric čiγɜ-rɜ — grave.

Ancestry of “sírunkban”, step by step

Step	Language	Word	Meaning
1	Hungarian	sír	grave, tomb, burial place; to cry, to weep
2	Proto-Finno-Ugric	čiγɜ-rɜ	grave