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Worldwide, Trefna (Trefna
) is a rare female forename. The forename Trefna is habitual in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is a rare feminine name. Also, Trefna is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Trefna | Democratic Republic of the Congo, Czechia, Slovakia, United Kingdom |