-kin
Origin 1
From Middle English -kin, -kinne, -kunne, from Old English cynna the genitive plural of cynn ("kind, sort, rank"), used in compounds. Compare otherkin.
Full definition of -kin
Suffix
Origin 2
From Middle English -kin, -ken, probably from Middle Dutch -ken, apparently representing Proto-Germanic *-ukīną, a double diminutive, from Proto-Germanic *-ukaz (Compare Old English -oc) + Proto-Germanic *-īną (Compare Old English -en). Cognate with Dutch -ken, Low German -ken, German -chen. More at -ock, -en.
Suffix
- (now archaic) Forming diminutives of nouns.