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kinfolk (n.)[kinfolk 词源字典]: also kin-folk, 1802, principally American English, but the earliest references are British, from kin (n.) + folk (n.). Kinsfolk is recorded from 1844.[kinfolk etymology, kinfolk origin, 英语词源]
kith (n.): Old English cyðð "kinship, relationship; kinsfolk, fellow-countrymen, neighbors; native country, home; knowledge, acquaintance, familiarity," from cuð "known," past participle of cunnan "to know" (see can (v.)). Cognate with Old High German chundida. The alliterative phrase kith and kin (late 14c.) originally meant "country and kinsmen" and is almost the word's only survival.