Last name Mcgillen (Mcgillen 
) , in all the world, is a rare cognomen. The last name Mcgillen is characteristic of Ireland, where it is a rare surname, New Zealand, and the United States. Measured by absolute frequency, this name is the most popular in the United States, Canada, and the United Kingdom.
| VARIANT | COUNTRY |
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| Mcgillen | Canada, New Zealand, Ireland, United Kingdom, United States |
| john mcgillen American baseball player, US (b. 1917) |
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| jessica b. mcgillen D.Phil. University of Oxford 2014 |
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| kathryn mcgillen researcher |
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| max r mcgillen researcher (ORCID 0000-0002-1648-0462) |
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| max r mcgillen researcher, ORCID id # 0000-0002-1623-5985 |
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