Geigh is based off of an Alicorn, a species of unicorn with a pegasus's wings. Its design also incorporates a triangular marking on its flank, which could be a reference to the cartoon My Little Pony. Pink triangles were used by the Nazis to identify homosexual prisoners. Both of these elements are commonly associated with homosexual men, further supported by its gender ratio being 100% male. Additionally, its tail is a rainbow, referencing the gay pride flag. Its shiny form somewhat resembles Rainbow Dash from the after-mentioned My Little Pony. Said shiny form's bright blue body combined with its pink mane and white wings may also be a reference to the transgender pride flag, a nod to how its pre-evolution will change gender upon evolution if it's female. The flaming mane could be a reference to the term “flaming homosexual“, which refers to a very flamboyant gay man.
Geigh may be a combination of gay and neigh, since "neigh" and "gay" rhyme, therefore "Geigh" is still pronounced "g-ay". It may also be derived from Geiger (as in Geiger counter, which is used to measure radiation). This could possibly be a reference to the concept of a “gaydar”, which is the supposed ability to tell if someone is gay or not.