Around the world, Ethna (Ethna 
) is a rare feminine given name. The given name Ethna is habitual in Ireland, where it is quite a rare girly name, the United Kingdom, where it is a rare female name, and Australia, where it is a very rare female name. Not in comparison with a country's population, this name is the most popular in the United Kingdom, the United States, and Ireland. Very seldom, Ethna is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Ethna | Indonesia, United Kingdom, Ireland, Mexico, United States |
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ethna carbery Irish writer and journalist, IE (b. 1866) |
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| ethna henrietta pauline halkett (born 1883) (b. 1883) |
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| ethna maccarthy Irish poet and paediatrician (1903-1959), GB (b. 1903) |
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| ethna byrne-costigan Irish academic and writer (1904-1991), IE (b. 1904) |
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| ethna rouse cricketer, NZ (b. 1930) |
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| ethna smyth Peerage person ID=381937 |
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| ethna mcferran researcher (ORCID 0000-0002-8918-7822) |
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| ethna of strathearn Peerage person ID=278482 |
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| ethna fidelma boyd researcher (ORCID 0000-0003-3342-964X) |
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| ethna regan IE |
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Awe, Mcmahon, Summers, An Chom, Carroll, Connell, Bradley, Brennan, Horigan, Higgins, Farrell, Oconnor, Mcgarvey, Mcgovern, Sullivan, Serkanic, Thompson, Elizondo, O'Mallon, Mccracken, Gallagher, Hauenstein, Maxwell, Hopper, Harris, Garvey, Lay, Barr, Reid, Dias, Moran, Moore, Meyer, Scott, Smith, Smyth, Hernandez, Burke, Doyle, Duffy, Lynch, Walsh, Mahony, Murphy, Piazza, Reilly, Dillon, Garcia, Byrne, and Fitzgerald