Four in japanese is 四 (yon). That means death too?
It's also read "shi" in compounds, IIRC. And yes, that does mean death, among other things. It seems like a pretty silly thing to worry about considering that it's one of the basic syllables of the language, but consider for example how many people pronounce DVD-R as "DVD minus R" now that DVD+R is popular -- little things like this can apparently be exploited to shape public opinion in subtle ways.