Where does “mérted” come from?

mérted (Hungarian) comes from Hungarian -ted, from Hungarian -ed, from Hungarian -é-, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “mérted”, step by step

Step	Language	Word	Meaning
1	Hungarian	-ted	Used to form the second-person singular past...
2	Hungarian	-ed	your; Used to form the definite second-person...
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 -ed →