Surname Cadigan (Cadigan 
) , in all the world, is quite a rare cognomen. The last name Cadigan is habitual in New Zealand, where it is quite a rare surname, Canada, where it is a rare surname, and the United States.
| VARIANT | COUNTRY |
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| Cadigan | Canada, United Kingdom, United States, New Zealand, Australia |
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george h. cadigan politician in Massachusetts, US, US (b. 1873) |
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pat cadigan American science fiction author, US (b. 1953) |
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| george l. cadigan (b. 1910) |
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| robert allen cadigan US (b. 1918) |
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| rosemary cadigan (b. 1943) |
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| dave cadigan All-American college football player, professional football player, offensive lineman, US (b. 1965) |
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| sean thomas cadigan (b. 1962) |
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| jennifer m cadigan researcher (ORCID 0000-0002-6915-8389) |
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| noel cadigan Ph.D. University of Waterloo 1999 |
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| ken m cadigan researcher |
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| noel g cadigan researcher |
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| john cadigan computational linguist (b. 1988) |
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