No Pokémon have the same type combination as Morgrem and its evolutionary relatives.
Morgrem and its evolutionary relatives are also the only Fairy-type Pokémon to have a double resistance to Dark-type moves.
Morgrem shares its category with Purrloin. They are both known as the Devious Pokémon.
Morgrem, Hattrem, and their evolutionary relatives can be considered counterparts. Both are Generation VIII Pokémon evolving once at level 32 then at level 42. Morgrem and its evolutionary relatives are male only, while Hattrem and its evolutionary relatives are female only. Their final evolved forms are both Fairy-type Pokémon with identical base experience and catch rates, and each Pokémon in each evolution line have the same base stat total as their counterpart (e.g. Morgrem and Hattrem both have a base stat total of 370). Morgrem and Hattrem are also based on mythical beings from European folklore and mythology: Morgrem resembles a goblin, and Hattrem resembles a witch. Furthermore, both Pokémon use their hair as a weapon, and their Speed drops upon evolution.
Morgrem seems to be based on the Cluricawne of Monaghan, a type of devious leprechaun from Irish folklore that bows down to lure its opponent and stab their eyes with its pointed hat. It also shares similarities with the redcap, a murderous goblin from English legend that carries a pikestaff, which Morgrem's hair seems to be shaped like. As its name implies, it may also be based on gremlins.
Morgrem may be a combination of morbid or morgue and gremlin. It may also come from grem, an old English and old German word for "to anger or to enrage".
Gimō may be a combination of 欺罔 gimō (deception), 毛 mō (hair, fur), and demon.