Blas Wilfredo Omar Jaime

Blas Wilfredo Omar Jaime (, 'dog without owner'; born ) is the only native speaker of Chaná, a Charruan language spoken in Argentina. He is now referred to as Tató Oyendén, or custodian of the ancestral memory.

The language, which Blas learned from his female ancestors, was considered extinct before he was interviewed by the linguist José Pedro Viegas Barros. The two men together authored the book La Lengua Chaná. Patrimonio Cultural de Entre Ríos, published by the official communications department of the provincial government of Entre Ríos. The department published the book in recognition of "Lanték" (the Chaná language) to support the cultural heritage of the province.