Charles Lamb the poet wrote under the name Elia Lamb, which is almost the same as Eli, so it isn't just Emmerdale. Eli is often referred to in the Bible and is the name or title of priest, so it has very good provenance. Whatever name you choose it will become easier to say with time and I am sure that if your child doesn't like it he will find a way of changing it to a nickname, so don't let other people dictate to you. Your baby, your choice of name.
I seem to remember a couple giving their beloved child the names of the complete Man. United football team. The registrar said that they must reduce the number to a reasonable figure, I can't remember what they eventually called the child.