Talk:The Witcher series/@comment-28661437-20160207084134/@comment-68.227.238.214-20180110042748

It does, and there were four from the Wolf School at the time of The Last Wish:

Eskel, a younger and highly skilled witcher

Lambert, about the same age as Geralt but with a sour disposition, especially towards sorcerers\

Coen, a young and impressionable witcher who becomes a favorite of Ciri's

Geralt, the most well-known witcher and hero of the series

Vesimir, the oldest living witcher and their mentor

It is explained that the witchers have lost the knowledge to make new witchers, which Triss Merigold suspects has to do with them no longer allowing sorcerers access to their secrets. She strongly believes magic in addition to their potions was required to create the mutations.

Bear in mind there are other schools (like the school of the viper where Letho of Gulet, Auckes and Serrit hail from).