The difference is: அயன் (as in Lord Brahma) vs. ஐயன் (as in leader). I must say the film titles could be quite confusing, considering the popular media in the electronic era have been taking a lot of liberties in using incorrect spellings in Tamil, peobably due to 'font problems'. So, they could even writing ஸ்ரீ as ஷ்ரீ!
