In the entire world, Вішняк (Вішняк , Vishniac ) is an extremely rare unknown gender forename. Much more frequently, Вішняк is the last name as well as the forename.
Vishnjak, Vishnyak, and Višnjak
Олег, Павло, Надія, Роман, Ірина, Дмитро, Аркадій, Георгій, Зінаїда, Валентина, and Олександр
, Vishniac 
) is an extremely rare unknown gender forename. Much more frequently, Вішняк is the last name as well as the forename.