Lowboy,
Incidentally, in Japan they are generally referred to as “Keyboard Harmonicas” (鍵盤ハーモニカ). Most people know that Yamaha makes “Pianicas” and that Suzuki makes “Melodions”. Few people know the term “Melodica (Piano)”, let alone that they’re made by Hohner.
I agree though, although an obscure instrument, in the US at least they are generally known as “Melodicas”.