I used to say "Vee", too! Had to train myself out of that one.
As for Akali, the name should be A-ka-lee. Why? She's clearly Japanese-inspired, and the correct pronunciation in Japanese would be "A-ka-lee". "A-call-ee" can't even be pronounced in Japanese. Sorry, but if the champion spotlight pronounces it that way, it's simply wrong. Or if not wrong, then at least very silly. Take your pick of the two.
As for Illaoi? Her name is, like, her secret passive that makes her awesome. Don't believe me? I recently had a game where I was in a call with the ADC. The ADC was being rather inattentive, so I elected to warn him that Illaoi was coming to gank him. Unfortunately, the warning didn't quite take, since he was completely confused by what I was trying to tell him.
"Hey, Ill-a-oy is coming in from the river!"
"What?"
"Uh, Ill- ... er. Ill-oi is coming."
"What's an Ill-oi?"
"The new one with the weird name, er-"
"Huh?"
"An ally has been slain!"
"... that one."