Last name Mclay (Mclay 
, Mcclay ) , all over the world, is quite a common cognomen. The cognomen Mclay is habitual in New Zealand, where it is quite a rare surname, Australia, and the United Kingdom. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Australia. Much less frequently, Mclay is the forename as well as the last name.
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| Mcclay, Mclay | Canada, United Kingdom, United States, New Zealand, Australia |
| george mclay Scottish footballer (1889-1917), GB (b. 1889) |
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jim mclay New Zealand politician, NZ (b. 1945) |
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| david mclay association football player, GB (b. 1898) |
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| alma soller mclay (b. 1919) |
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| ernest james mclay (born 1941) (b. 1941) |
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| douglas stuart mclay (born 1942) (b. 1942) |
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| colin mclay New Zealand carcinologist, NZ (b. 1942) |
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daniel mclay British road cyclist, NZ (b. 1992) |
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| alastair david mclay (born 1946) (b. 1946) |
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| trevor sale mclay (born 1947) (b. 1947) |
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| sheryl joy mclay (born 1949) (b. 1949) |
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| norman walter mclay (born 1951) (b. 1951) |
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| ian murray mclay (born 1956) (b. 1956) |
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| stephen james mclay (born 1962) (b. 1962) |
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| kenneth stuart mclay (born 1963) (b. 1963) |
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