Middle name help please!

I want to name my baby girls middle name after my grandmother who raised me, my SO said he doesn't care what her middle name is as long as I don't name her Malen which is one of his sisters middle names. At first I really liked it but now one of his sisters is acting as thou I have to make it her middle name. Now I'm to the point that I don't like the middle name anymore. The name I want to pick is Elleona after my grandmother. She is my daughter so I should pick what I want right?