All over the world, Юстас (Eustace 
, Justas 
, Юстас 
) is quite a rare boy's first name. The given name Юстас is habitual in Lithuania, where it is quite a common boy's name, Saint Kitts and Nevis, and Tanzania, where it is quite a rare male name. In absolute terms, it is commonest in Lithuania, the United States, and Tanzania. Likewise, Юстас is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Eustace | United Kingdom, Kenya, Zambia, United States, Tanzania |
| Justas | United Kingdom, United States, Tanzania, India, Lithuania |
| Юстас | Kazakhstan, Russia, Ukraine |
Efstathios, Eustac, Eustacchio, Eustach, Eustache, Eustachio, Eustachy, Eustacio, Eustacius, Eustacjusz, Eustahije, Eustaqui, Eustaquio, Eustasio, Eustasius, Eustathios, Eustazio, Eustazy, Eustațiu, Eustácio, Eustáquio, Evstafy, Evstahij, Ostap, Stathis, Yustas, Ευστάθιος, Στάθης, Астафий, Евстатий, Евстафий, Евстахий, Остап, Остафий, Стафей, Эсташ, Євстафій, and يوستاس
Юстас is also a name for the fictitious and mythical characters: Eustace Scrubb , the fictional boy, a lead character in The Chronicles of Narnia, books 3 and 4, The Last Battle; Paris Geller , the fictional character from the television series Gilmore Girls; Eustace Bagge , the character from Courage the Cowardly Dog; Claud Eustace Teal , the fictional character, The Saint and Eustace , the fictional character from Granblue Fantasy, among other works.