Family name Lewellyn (Lewellyn 
) , throughout the world, is quite a rare surname. The last name Lewellyn is characteristic of the United States, where it is a rare surname, New Zealand, where it is a very rare surname, and Nicaragua. Measured by absolute frequency, it most frequently occurs in the United States, China, and the United Kingdom. Much less frequently, Lewellyn is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lewellyn | Philippines, China, United States, South Africa, United Arab Emirates |
| marvin lewellyn American football coach (1919-2010), US (b. 1919) |
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| sabe lewellyn American artist and writer, GB (b. 1977) |
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| krista lewellyn researcher, ORCID id # 0000-0003-4924-6362 |
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