Throughout the world, Gyllian (Gyllian 
) is a very rare unisex first name. Very seldom, Gyllian is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Gyllian | United Kingdom, Australia, Philippines, United States, Brazil |
| gyllian diane greville-williams (1922-2001) (b. 1922) |
|
|
| gyllian raby Canadian writer, CA (b. 1959) |
|
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