If you have information about this name, share it in the comments area below!
Books about Pafnuty:
Oeuvres de P. L. Tchebychef (Pafnuty Lvovich Chebyshev), Tome I by P.L. Tchebycheff (1961)
Wiki information Pafnuty:
Pafnuty Lvovich Chebyshev was a Russian mathematician. His name can be alternatively transliterated as Chebychev, Chebysheff, Chebyshov; or Tchebychev, Tchebycheff; or Tschebyschev, Tschebyschef, Tschebyscheff.
In mathematics, the Chebyshev integral, named after Pafnuty Chebyshev, is where is an incomplete beta function.