Cognomen Ellefson (Ellefson 
) , all over the world, is quite a rare surname. The last name Ellefson is characteristic of the United States, where it is a rare surname, Canada, and New Zealand.
| VARIANT | COUNTRY |
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| Ellefson | United Kingdom, Mexico, United States, Canada, New Zealand |
| christian ellefson American politician, US (b. 1842) |
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| john ellefson American politician, US (b. 1886) |
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| eric j. ellefson American politician, US (b. 1889) |
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david ellefson American bass guitarist, US (b. 1964) |
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| ray ellefson American basketball player, US (b. 1927) |
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| art ellefson Canadian musician, CA (b. 1932) |
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peter ellefson |
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| stephen ellefson Canadian para-alpine skier, CA (b. 1954) |
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| e. ellefson politician |
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| mark ellefson researcher |
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| michelle r ellefson researcher |
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| gene ellefson college basketball player (1971–1973) Creighton |
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| jared w ellefson researcher |
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| ben ellefson American football tight end, US (b. 1996) |
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