Please help with my baby name dilema!!!?

ok... so a few months ago, i asked about shaun timothy.. which i adored.... and i really wanted a boy... but my little princess is just that... a girl. lol (but i love her dearly...) my husband couldnt decide on a name for a girl, so we waited.... finally many convo's and one little mermaid pen later, he fell in love with the name ariel... anyone have any spelling variations on ariel, and also, i need a middle name... thanks so much in advance...