Worldwide, Thomasius (Thomasius 
) is an extremely rare male first name. Much more frequently, Thomasius is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Thomasius | Germany, United Kingdom, Australia, Singapore, Switzerland |
| jenkin thomasius (b. 1675) |
|
|
| traugott thomasius (b. 1709) |
|