In all the world, Mattiusi (Mattiusi 
) is an extremely rare epicene forename. More frequently, Mattiusi is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Mattiusi | Argentina, Canada, France, Brazil |
| mattiusi naulituk Canadian sculptor, CA (b. 1904) |
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| mattiusi iyaituk Canadian sculptor, CA (b. 1950) |
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| mattiusi qimmaluk luuku Canadian sculptor, CA |
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