Where does “sejtfalak” come from?

sejtfalak (Hungarian) comes from Hungarian -ák, from Hungarian -k, from Hungarian -ö-, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

Ancestry of “sejtfalak”, step by step

Step	Language	Word	Meaning
1	Hungarian	-ák	s, -es
2	Hungarian	-k	-s, -es; Denotes the first-person singular...
3	Hungarian	-ö-	linking vowel
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 -k →Every word from Hungarian -d →