Where does “koszinuszok” come from?

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

Ancestry of “koszinuszok”, step by step

Step	Language	Word	Meaning
1	Hungarian	-ök	-s, -es; Used to form the first-person singular...
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 -ök →Every word from Hungarian -k →