[copied from Anime SE at moderator's suggestion]
There is a 2008 anime-original series called Net Ghost PiPoPa. (For some reason, the version streaming on Crunchyroll is called "Web Ghosts PiPoPa", but the Hepburn is Netto Gōsuto Pipopa. Thus I'll stick with the name given by MyAnimeList and the English Wikipedia.) It is a kid show about a boy (Yuta) getting trapped in the Internet.
Anyway, Yuta meets three friends, Pit, Pot, and Pat (pronounced pitto, potto, and patto). They are web ghosts and live there. From their very first meeting, Yuta refers to them as a single entity PiPoPa. The Wikipedia entry refers to this name as "an onomatopoeia of computer beeps". 😐 Is concatenating three alliterative names like that something a Japanese child might do? It strikes me as very odd, not to mention naming the three obviously separate individuals as one entity. They also make it clear that they do not like being called "PiPoPa".