What if there were another Bethlehem?

Yes, what if?

Bruce Chilton looks at that idea near the end of a long essay on just what it meant for Jesus to be a mamzer, above all in terms of parentage, but also in terms of birthplace.

What IF there were another Bethlehem?

One further north than the famous one.

One so far north as to be just 7 miles from Nazareth?

And that (also undercutting mythcists once again) existed in the first century CE.

There is such a place. Chilton knew about it decades ago when doing his PhD. We now have more.

As for what this means?

Chilton postulates that Jesus was conceived a mamzer, which could mean nothing more than Joseph diddling Mary after betrothal but before marriage. They were from Nazareth. He took her to Bethlehem for the birth. Birth narratives arose from that.

(Rural poor areas may have differed from Jerusalem on the issue of post-betrothal sex. Chilton says a general Galilee vs Jerusalem difference is not proven.)

The second Bethlehem? Joshua mentions one in land alloted to the tribe of Zebulon. Chilton says Talmudic-era texts have more. And archaeology confirms the site mentioned above. 

Beyond that? You'll have to read for yourself. On this piece, at least, Academia does not allow a copy-paste, at least not with legible words.