From Old English 'cynraeden' (kinship) — 'cynn' (kin) + '-raeden' (condition), from PIE *genh1- (to beget).
One's blood relatives collectively; a group of related people. As an adjective, similar in kind; related.
From Middle English 'kinrede', from Old English 'cynræden' (family, race, kinship), compound of 'cynn' (kin, race) + '-ræden' (condition, rule, state), from Proto-Germanic *kunją (family) + *rēdijaną (to advise, to rule). The root 'cynn' traces to PIE *Ƶenh₁- (to beget), the same root as Latin 'genus' and Greek 'genos'. The suffix '-ræden' (also found in Old English 'hete-ræden', hatred) means 'state or condition.' By the 13th century 'kinrede' had lost the suffix's independent meaning and was felt
The '-dred' in 'kindred' is the same suffix as in 'hatred' — Old English '-rǣden' meaning 'condition' or 'state.' Kindred is literally 'the state of being kin,' just as hatred is 'the state of hating.' The final '-d' was added by analogy with 'hundred,' making the word look like it ends in '-dred' rather than '-red.'