In the world, Kelby (Kelby 
) is quite a rare predominantly boy's, but very infrequently female forename. The first name Kelby is characteristic of the United States, where it is a rare principally male, but very seldom female name, the Dominican Republic, where it is a rare masculine name, and Uruguay. Not in comparison with a country's population, it most frequently occurs in the United States, South Africa, and the Dominican Republic. Much less frequently, Kelby is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Kelby | Canada, Dominican Republic, United Kingdom, United States, Malaysia |
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kelby woodard American politician, US (b. 1970) |
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kelby tomlinson American baseball player, US (b. 1990) |
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| n. m. kelby American writer, US (b. 1957) |
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| kelby ouchley (b. 1951) |
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| kelby pickering Australian cricketer, AU (b. 1976) |
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| kelby stuckey (b. 1967) |
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| kelby j. anderson American particle physicist |
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| kelby griffin college basketball player (1972–1972) Middle Tennessee |
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| kelby kramer college basketball player (2019–2019) Montana |
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| kelby losack writer |
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| kelby smith-han researcher (ORCID 0000-0003-2105-5062) |
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| kelby stuckey college basketball player (1986–1989) Missouri State |
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| kelby halbert Canadian alpine skier, CA (b. 1990) |
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| kelby anno |
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Cox, Steele, Carter, Barnes, Taylor, Thomas, Nelson, Harris, Howell, Hughes, Walker, Wilson, Jackson, Johnson, Sullivan, Stephens, Anderson, Chambers, Peterson, Phillips, Robinson, Thompson, Miller, Morgan, Morris, Martin, Lee, Cook, Berg, King, Reed, Moore, Smith, Allen, Adams, Clark, Williams, Brown, Price, Davis, Dixon, Green, Lewis, James, Jones, Olson, White, Young, Kraft, and Velasquez