Thinking about changing my baby girl name..

Jennifer
Lately this week I have been wanted to change my baby girl name ...my how can I explain to 8 yr old daughter who over the moon with the name Selena .. there no nickname for the name Selena .. I love the name ..But I wanted to change it to Ana in spanish her nick will be Anita .. i love the middle Eliana .. i have no idea what to do im in dilemma.. this is my 3rd baby.. but my i have 2 kids girl and boy in that order ..I dont if I should or keep or leave it alone Selena Eliana or change it.. I dont want to hurt my daughter feeling ..she has been calling her baby Selena ever since I found out its girl.