Looking for another name!

Hi! I'm pregnant with our third. Our first two kids are a boy/girl twin pair, named Mia and Fos. We know our baby is going to be a girl, and we had Ava in mind for a long time. However, my sister-in-law gave birth to an Eva two weeks ago. At first we stuck with Ava, but the more we think about it, the less we like it. Eva and Ava seem a bit too similar, and the girls will share the same grandparents, etc. They'll also most likely go to the same school and have the same last name. A bit too much the same, Eva and Ava. So: do you have any ideas for another name? Preferably one that fits with Mia and Fos, but it doesn't have to be three letters (we liked that mainly for the twins). Otherwise no specific requirements! I look forward to hearing from you! Thanks, Eline (on behalf of my husband Daniel, and kids Mia and Fos)