It's pretty common to see -- and be annoyed about -- people using Greek letters in logos with little regard for what sound the letter actually represents. Using a sigma for an E (instead of its proper "s" sound) is the most popular, but I've also seen a lambda used as an A instead of an "l." I just came across an example of this kind of adulteration being done to Cyrillic, in the logo for a new History Channel documentary:

So tune in on Memorial Day at 9 EDT for "Yats-ssia, Land of the Tsars."