I do like Eliza and Alanah
You have very good taste! I have an Alannah and of course as I said I love love love Eliza but didn't want to couple it with Alannah.
On the 'ee' thing, me, my brother and my sister all end in y so all have the 'ee' sound (and all have 2 syllable names ) and I don't think any one has ever commented about it. Mum and Dad weren't particularly aware of it at the time, they said it just kind of happened that way.