Interestingly, the monster is never given a name in the novel (though referred to as the “monster” or “wretch” or similar terms). The monster says at one point “I ought to be thy Adam” (referring to the Biblical creation), but that isn’t his actual name - more a description.

His namelessness seems to have been a deliberate choice by the author, as it emphasizes just how alienated and remote from humanity he is, as a result of Victor’s (and society’s) rejection.

His own creator never gave him a name … and, in pride and on rejection of the society that rejected him, “the monster” refuses to give himself one.