Cognomen Cilley (Cilley 
) , around the globe, is a rare surname. The cognomen Cilley is habitual in Argentina, where it is a rare surname, the United States, and New Zealand, where it is a very rare surname. Measured by absolute frequency, it is commonest in the United States, Argentina, and Australia.
| VARIANT | COUNTRY |
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| Cilley | Australia, Canada, Argentina, Brazil, United States |
| joseph cilley American politician, US (b. 1734) |
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joseph cilley American politician and farmer (1791-1887), US (b. 1791) |
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jonathan cilley American politician (1802-1838), US (b. 1802) |
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| daniel plumer cilley (b. 1813) |
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| clinton a. cilley United States Army Medal of Honor recipient (1837-1900), US (b. 1837) |
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| jonathan prince cilley (b. 1835) |
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jorge cilley Argentine rugby union footballer, AR (b. 1914) |
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| juan cilley Argentinian association football player (1898-1954), AR (b. 1898) |
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| roger howard cilley Suffragan bishop of the Episcopal Diocese of Texas (1918-1986) (b. 1918) |
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| jacalyn cilley American politician, US (b. 1951) |
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| marla cilley (b. 1956) |
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| josé cilley Argentine rugby union footballer, AR (b. 1972) |
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| jodi cilley film producer, US (b. 1977) |
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