Surname Tréhiou (Tréhiou 
) , in the entire world, is an extremely rare cognomen. The cognomen Tréhiou is habitual in Western Europe, particularly France, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tréhiou | France |
|
hippolyte tréhiou French parson (1880-1941), FR (b. 1880) |
|
| clément baudin tréhiou researcher (ORCID 0000-0002-5100-7769) |
|