I think a lot depends on what her last name will be - and if it's Logan, you should really rethink putting a child's name on the internet like this, especially with your first name and town! I know the child isn't here yet, but internet safety is primary.
Otherwise, spell out the initials to be sure it doesn't make a word that's either derogatory or will cause people to make fun of her. For example, the initials "ELF" would be silly. I know a girl whose initials are "EEK" and it's not good.
I think Eriana is a name you made up, right? So, unless it's a family name that means something sentimental to you, you might want to think that through. You should realize that your child will spend her life telling other people, "No, I'm not Arianna. I'm Eriana." She may resent you. A child's name is her name - it's not just something to please the parent who thought it up.
Your name is A., and there are already so many spellings of that, right? You've had people misspell it your whole life. Be sure you want that for your child.
I don't think a "perfect name" is the most important thing we can do for our children. Raising them with love, values and priorities is much more critical. Your child will thank you for taking care of yourself, putting aside money for braces and college, and making a house safe and nurturing. Cute baby clothes, an expensive nursery and similar superficial things just don't matter in the long run. It's easy to get distracted by the "fun" parts of pregnancy and parenting rather than focus on the practical realities of parenting. If you check all the other questions on Mamapedia, you'll see that most of them deal with substantive issues, and you'll see some of the challenges ahead of you. It's a useful site that way.