Last name Eiby (Eiby 
) , around the world, is a rare family name. The cognomen Eiby is characteristic of Denmark, where it is quite a rare surname, Honduras, and Australia, where it is a rare surname. Likewise, Eiby is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Eiby | Mexico, Australia, Honduras, Venezuela, Denmark |
| george eiby New Zealand seismologist, artist and author, NZ (b. 1918) |
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| tine eiby Danish journalist (b. 1957) |
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| yvonne a. eiby researcher ORCID ID = 0000-0003-0079-7796 |
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| may bjerre eiby DK |
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