yep, they do mispronounce jonas name.
They also mispronounce zydrunas ilgauskas name in their other song.
But i think we kind of used to americans who can never get it right, or not even trying..
I also don't understand a trend in USA to call people the shortest possible way, like Z, V, JoVa (weird), or MJ and so on. Horrible laziness
It's like some people would waste huge amounts of energy to pronounce Jonas
Btw, the lyrics of a "song" is kind of silly and banal...