The OP did not even do an online search before starting the rumor. Are all the people with the first name John related in this country or, the same person?
#2, 3, and 4 are all correct. I've been to Japan and the word "Daiichi" is very commonly used in a variety of commerce. There is a tour bus company in Japan called "Daiichi", and NO it is NOT owned by DSI. "First" or "Number One" is the best translation to English. "ichi" = 1 (one) "dai" prefix = superlative Daiichi Sankyo has no involvement with nuclear power whatsoever. Otherwise Bill McLean or Rick Parrish would have told us so. Fukushima Daiichi Reactor = Fukushima #1 Reactor If DSI stock is tumbling, it's because Japan, in general, is on it's heels from quake/tsunami.