Is Ephraim the name you're thinking about?

Ephraim strikes me as a nice blend of current trends today, uncommon Biblical and vintage/fusty.  I think it'd fit in fine, while still being less common than something like Ezra.

I looked up stats for it & see that it's never really been popular, it peaked at #761 in 1902 before falling out of the top 1000 completely in 2014.  It is on the rise though, ranking #962 in 2013 and #928 in 2014.  I wouldn't be surprised to see it continue to rise as people keep looking for more uncommon Biblical style names.

No idea about the theological history of it. I'm sure others will be able to weigh in there.

What is your concern? Ephraim is a biblical name and I believe fairly common among the Amish community, so that's what I tend to think when I see it.

I would assume an Ephraim was from a very religious family-probably conservative homeschoolers. 

Not a bad thing-just my impression, since it seemed that was what you're after.

I could quickly alter that after meeting one irl, of course.

I am a theologian and still had to look up some notes to remember, so be assured almost no one will have any associations with the name Ephraim:). Good news is, nothing bad about the name Biblically I think. Original ephraim was Joseph's younger son, who received his blessing at the end of genesis (After all the business with the amazing technicolor dreamcoat;)). Later he becomes the namesake for half of the house of Joseph, one of the twelve tribes of Israel. when Israel split into two the tribe of ephraim was a strong leader in the northern kingdom, which was destroyed and its history largely lost when Assyria invaded. So if you're concerned about the name not showing up in the NT that's why - not because of anything bad about the name, because of "loss" of all ten tribes that were in the north (although of course their descendants almost certainly continued in the larger Jewish community). There may be stray reference or two to prophecies about ephraim and Judah coming together - that's shorthand for the day when all Jews or all peoples are one again, since they became separate in the 2 kingdoms. Not anything troubling. Mormons may have a different take because I know they have a distinct theology of the tribes, so if you're Mormon find a leader to check in with - but just in the NT by itself I can't think of any place where ephraim would have really negative associations. If there's a particular passage you're thinking of let me know and maybe we can figure it out!

Love the uniqness of this name.  Have you considered a shortened version/nickname or planning to use full name only?

I like it.  I think there will be a lot of pronunciation struggles because it doesn't follow phonics rules and it's not a terribly familiar name, but I don't think that's a deal breaker at all.  It's a good, solid name.  

 I didn't notice the date on the OP, so am deleting.