Cognomen Treby (Treby 
) , worldwide, is a rare surname. The cognomen Treby is habitual in Australia, where it is a rare surname, the United Kingdom, and New Zealand. In absolute terms, it most frequently occurs in the United Kingdom, Australia, and the United States. Much less frequently, Treby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Treby | United Kingdom, Australia, Canada, United States, France |
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george treby British judge and politician (b. 1644) |
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george treby politician (b. 1685) |
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| george treby (1685-1741) (b. 1685) |
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| george treby British Member of Parliament (born c1685) (b. 1685) |
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| charity treby (born 1722) (b. 1722) |
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| george hele treby British politician (b. 1725) |
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| george treby British politician (b. 1725) |
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| paul curry treby (1786-1862) (b. 1786) |
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| katherine treby (1789-1823) (b. 1789) |
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| anne letitia treby (born 1795) (b. 1795) |
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| henry hele treby (1801-1867) (b. 1801) |
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| blanche jemima treby (1811-1876) (b. 1811) |
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| cyril george treby (1917-1988) (b. 1917) |
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| ivor c. treby British poet and literary critic (1933-2012), GB (b. 1933) |
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| judith isobel treby (1942-2000) (b. 1942) |
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Mr, Jill, Tina, Nick, Emma, Fred, Margo, Megan, Sarah, Susan, Alice, Allan, Angie, Colin, Clare, Clive, Brian, Bryan, Karen, Kelly, Peter, David, Judy, Jess, John, Jack, Ms, Sam, Caz, Ben, Bec, Ron, Jon, Tom, Tim, Zac, Gavin, Mark, Mike, Suzy, Alex, Alan, Andy, Anna, Adam, Bill, Paul, Dawn, Matt, and Gemma