So I see that the name is derived from an esperanto word (apparently meaning "flatter") but in spanish it would also mean a small burp ("flato" being an informal term for burp). Which I still like as a name ;)
Oddly, Wiktionary has an article for sideache² and a link to that page if you look for side stitch. Makes me curious how often that is the case now. [/me sniped]