Family name Lonseth (Lonseth 
) , in all the world, is a very rare surname. The cognomen Lonseth is habitual in Norway, where it is a rare surname, Canada, where it is a very rare surname, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Lonseth | Canada, Norway, Brazil, United States |
| arvid turner lonseth Ph.D. University of California, Berkeley 1939 |
|
|
| solveig lonseth (b. 1986) |
|
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