The Taxifisch came about in resemblance of the memorable Babelfish of Douglas Adams’ Hitchhikers Guide to the Galaxy. I very often unintentionally ended up in the position of being the intermediary between techies and “normal” people and actually grew to love the place.
The “Taxi” stands for either the taxi, the cab, or the verb “to taxi”. Both reflect movement, reaching a desired position.
Since it’s origin is in German the spelling is the spelling of the German word for “fish”.
And that’s how little rosy fish came about.