We'll have to ask a Finn, demi. Linux was named after the Finnish programmer, Linus Torvalds. The first name of Linus Pauling, the American winner of the Nobel Peace Prize, is pronounced /lain?s/.
I believe I've always heard it said so as to rhyme approximately with "tin tux" (rather than with "fine tux", if that's what you're asking), but I will readily defer to a computer expert on this one!