I don't think that would be horrible, but I wouldn't do that if I were you. Sorry! :)
Eli and
Elijah are not only related, but so very close to each other.
I'm a bit biased in this subject, though: my oldest sister's middle name is
Maria and my middle name is
Marjaana - related names. It has always bothered me a little, even though it's just a middle name and not many people know them.
I still know.