Last name Tregellas (Tregellas 
) , in all the world, is a rare cognomen. The family name Tregellas is habitual in Czechia, where it is a rare surname, Australia, where it is a very rare surname, and the United Kingdom. In absolute terms, it is commonest in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Tregellas | United Kingdom, Australia, Brazil, United States, Czechia |
| walter hawken tregellas English draughtsman and writer (b. 1831) |
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| jason r tregellas researcher (ORCID 0000-0003-3645-2562) |
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