Honestly, I think its not a big deal.. Its not the same name, just rhymes.
You said yourself that they won't see each other a lot??
If however it was the same name, then I would think that to be unusual.

My friends LO's name is Ashleigh. Her sister named her LO, Isleig h. I've talked to her openly about it, and she doesn't have a problem with it, and they see eachother every second day.

Maybe if I knew the names you were talking about? Could you space between letters to avoid it coming up in a search?