There are 22 unique child surnames beginning with K:

Kane	Kaufman	Keckley	Kellin	Kelso	Kennedy	Kent
Kilbury	Kilfian	Kilgore	Kimball	Kinney	Kipker	Kirby
Kleiber	Kline	Klinefelter	Knotts	Knust	Koerner	Kramer
Kraner

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