the Gipsy was not named after a group of people but a moth (lepidoptera type) as were most of the DH single piston engine aircraft
As a stand alone word "Gipsy" refers to a group of certain people, not a moth, though it can be seen where de Havilland derived the word, as a contraction of the "Gipsy Moth" aka the moth
Lymantria dispar, which is also known as the "Gypsy Moth". Irrespective of the spelling used, both are referring to the same thing, though de Havilland used the "I" format. Purists can get their knickers in a knot over semantics, I am one.
https://en.wikipedia.org/wiki/Lymantria_dispar_dispar