No offense taken Frank, but considering I've been living in Japan for 16 years I hardly need your lesson on Japanese speech.

Japanese confuse rs & ls frequently (mostly due to pronouncing them the same when speaking English). Check out engrish.com & you can prolly find plenty of examples
Sushi is not a Japanese name, there are no Japanese named that ...some people think Sony is a name too.
I've heard people joke about 'Mericans named Hamburger ....calling that an insult would also be a bit of a stretch, but hey whatever, I wasn't trying to make a big deal of this stuff.