Dudley Dursley is the name that Vernon Dursley told Petunia Evans he intended to give his first son when they were dating in college.
The idea of having a son named "Dudley Dursley" upset Petunia so much that she begged her sister Lily to give her a potion that would make her beautiful and liked by other people; Lily eventually complied when Petunia threatened drastic action.
It is unknown whether Vernon Dursley married, but if he did, it can be presumed that if he had a son he would have named him Dudley; thus, there may be a Dudley Dursley somewhere in the MOR universe.