In all the world, Seyis (Seyis 
) is an extremely rare masculine first name. Much more prevalently, Seyis is the last name as well as the forename.
Mr, Naci, Elif, Esma, Esra, Eray, Eren, Erol, Enes, Emir, Emin, Emel, Emre, Ebru, Hacı, Feti, Irem, Orsc, Onur, Omer, Zeki, Utku, Gül, Merve, Boss, Batu, Ms, Ali, Can, Cem, Gã, Eda, Ege, Efe, Mina, Mine, Sami, Sait, Suat, Sema, Seda, Sefa, Alex, Arzu, Adem, Akif, Ayse, Baki, and Melih