LS - it's a Gipsy. DH purists are offended!
Well, they better get unoffended. The spelling from circa 1930's it seems that both means were accepted in the advertising of aircraft. The RAAF pilot notes of February 1944 spell it as "Gypsy", and calls for 73 Octane, though de Havilland used "Gipsy". Wonder how the alternate spelling came about so early in the power plants life?. Both means of spelling refer to the same particular group of people ie alternate spellings of the same word. I get where you're coming from though re purists, better tell the RAAF and all those 1930 era people they got it wrong I guess.
If you look at this article both spellings are used.
https://www.flightglobal.com/pdfarch...0-%200477.html