He himself wrote his name Іωаннъ Ужевичъ Словянинъ ("Ioann” Uzhevych” Slovyanyn”"), "Ioannes Usevicius Sclavonus", "Ioannes Ugevicius Sclavonus", "Jan Użewic"; in the student register of Cracow University he is written "Ioannes Petri Uzewicz".
Jan Użewicz; сам писал свое имя — Іωаннъ Ужевичъ Словянинъ, Ioannes Usevicius Sclavonus, Ioannes Ugevicius Sclavonus, Jan Użewic; в списке студентов Краковского университета — Ioannes Petri Uzewicz) (10-е гг.