Nancy you are too funny. But it's a good thought. Is it Lana like banana? Or Lana with an awwww sound? - as in Lana like your lawn - a.
Well . . .
In Smallville and Superman II, it's "La-na," while Clark in L&C says Lana like "banana" sometimes and either he or other characters say "La-na" other times (going by "Tempus Anyone?" here). I think it's all just a matter of "I say po-tay-toe, you say po-tah-toe."
Me? I've always preferred "La-na" myself--Lana like "banana" always sounded really nasal and annoying to me.