All the Alison's I know are very nice, but middle aged so I wouldn't think of it as a cute or cool baby name but in case helps here is some background and variations on the name, it's from a US site (as you might guess) but I rather like Allese myself:
ALISON
Gender: F
Origin: Norman French, diminutive of ALICE
Popularity in 2009: #227
Long popular in Scotland and widely used here since the fifties, this more feminine medieval derivative of Alice has now far surpassed the original in popularity.
Nicknames & Variations:
Alisoun, Alicen, Allysoun, Allese, Alicyn, Allecenne, Alisin, Alisen, Alleyson, Allisson, Alisanne, Allicen, Alyson, Alisonn, Alysun, Allie, Alisun, Allysann, Allix, Allisanne, Allisen, Allysanne, Allisan, Ali, Alysanne, Alysann, Alles, Ally, Allsun, Alisson, Alysoun, Alysen, Allisann, Allisoun, Alysan, Allisyn, Allyson, Allicenne, Alision, Alisenne, Allison, Alisann, Allice, Alisan