Surname Mclagan (Mclagan 
) , in the entire world, is a rare last name. The cognomen Mclagan is habitual in Guernsey, where it is quite a common surname, New Zealand, where it is a rare surname, and Australia. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
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| Mclagan | United Kingdom, Australia, South Africa, Canada, United States |
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peter mclagan British politician (b. 1823) |
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sara anne mclagan Canadian newspaper publisher (b. 1855) |
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| john mclagan Canadian newspaper founder (b. 1838) |
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angus mclagan New Zealand politician, NZ (b. 1891) |
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ian mclagan English keyboardist (1945–2014), GB (b. 1945) |
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| robin donald douglas mclagan (born 1940) (b. 1940) |
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| graeme mclagan British journalist (born 1943) (b. 1943) |
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| kim mclagan British model (1948-2006), GB (b. 1948) |
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| patricia a. mclagan (b. 1945) |
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| jann louise mclagan (born 1966) (b. 1966) |
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| anthony robin douglas mclagan (born 1967) (b. 1967) |
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| nicola julie mclagan (born 1969) (b. 1969) |
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| jennifer mclagan Canadian chef, CA |
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