Where does “köszi” come from?

köszi (Hungarian) comes from Hungarian köszönöm, from Hungarian -öm, from Hungarian -ö-, from Hungarian -d, from Middle Welsh -nt — 3rd person plural verb ending.

köszi (Hungarian): thanks

Definitions

thanks

Ancestry of “köszi”, step by step

Step	Language	Word	Meaning
1	Hungarian	köszönöm	first-person singular indicative present definite...
2	Hungarian	-öm	Used to form the first-person singular present...
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 -d →Every word from Hungarian -öm →