Correct! Kyrie is the vocative form (used for adressing people) of Greek "kyrios". As an adjective the word means "strong, valid", as a noun "Lord, master, Mister".
It seems to be a loan word from Persian, but I'm not sure whether this piece of information refers only the Name
Cyrus (same as
Kyros) or also to Kyrios; maybe the two are not related after all.
Andy