Cognomen Kayll (Kayll 
) , in the entire world, is a rare family name. The surname Kayll is characteristic of New Zealand, where it is a rare surname, the United Kingdom, and Australia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in the United Kingdom, Canada, and Australia. Much less frequently, Kayll is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kayll | Australia, Canada, New Zealand, United Kingdom, United States |
| joseph kayll British flying ace, GB (b. 1914) |
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| david kayll born 1918; father of Tessa Roche, Baroness Fermoy (b. 1918) |
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| p. mark kayll Ph.D. Rutgers University, New Brunswick 1994 |
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| mary kayll Peerage person ID=181034 |
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Mr, Steve, Allan, Chloe, Carol, Becky, Karen, Peter, David, Grant, Laura, Linda, Lucia, James, Helen, Murray, Sandra, Steven, Stacey, Stuart, Simon, Shaun, Sarah, Emma, Ms, Kay, Pat, Rob, Dan, Liz, Zac, Mary, Alan, Alicia, Andy, Brad, Paul, Pete, Glen, John, Jill, Tony, Tina, Eric, Cary, and Alysha