Surname Tregellis (Tregellis 
) , throughout the world, is a very rare cognomen. The last name Tregellis is characteristic of the United Kingdom, where it is a very rare surname, Australia, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in the United Kingdom, Australia, and Germany. Much less frequently, Tregellis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tregellis | Germany, Canada, United Kingdom, Australia |