Last name Mcclennan (Mcclennan 
) , across the world, is a rare cognomen. The surname Mcclennan is habitual in New Zealand, where it is quite a rare surname, Australia, where it is a rare surname, and Canada. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
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| Mcclennan | United Kingdom, Australia, United States, Canada, New Zealand |
| tommy mcclennan American Delta blues singer and guitarist (1905-1961), US (b. 1905) |
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| mike mcclennan New Zealand rugby league footballer and coach (1944-2019), NZ (b. 1944) |
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| brian mcclennan New Zealand rugby league footballer and coach, NZ (b. 1962) |
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| darren mcclennan New Zealand association footballer, NZ (b. 1965) |
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| howard dodds mcclennan Peerage person ID=302478 |
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| kenneth mcclennan Peerage person ID=302477 |
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