Where does “késsél” come from?

késsél (Hungarian) comes from Hungarian -jél, from Hungarian -él, from Hungarian -é-, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “késsél”, step by step

Step	Language	Word	Meaning
1	Hungarian	-jél	The long form of the second-person singular...
2	Hungarian	-él	Added to a verb to form a noun; Added to a verb...
3	Hungarian	-é-	—
4	Hungarian	-d	your; Used in the second-person singular definite...
5	Middle Welsh	-nt	3rd person plural verb ending

Every word from Middle Welsh -nt →Every word from Hungarian -d →Every word from Hungarian -él →