Hayt De Vries is the Harkonnen mentat in Dune 2000. He was portrayed by Robert Carin. He is described as being ruthless, brilliant, cold, cruel, and an egomaniac.
The name comes from a portmanteau of two names given in the Dune books, namely Piter De Vries, and Hayt, the Duncan Idaho ghola.
In the Dune 2000 manual, it states that Hayt is a ghola purchased from the Tleilaxu.