How Can I Prove I'm Right?
Your husband is trying to explain his negative reaction to Eleanor in logical terms. That's respectful of him; he knows that "No, because I say so" is a lousy approach to marital disagreements. Choosing a name, though, isn't like choosing a mutual fund or an infant car seat. It's not about facts and figures, it's about emotions.
Imagine that instead of "old-fashioned" your husband had said "unattractive." Would evidence that other people are attracted to the name mean that he's wrong about his personal taste, and that Eleanor actually does appeal to him?
You're not the first couple to go down this road with the name Eleanor. For some reason, the name is a particular flashpoint between moms and dads. I could line up dozens of women to attest to its classic, elegant dignity, and dozens of men to attest to its mustiness.
So instead of arming you with statistics about the rising popularity of the name Eleanor, I'd like to encourage you to rethink your approach. If you're determined to bring your husband around on Eleanor, don't waste your time on facts and figures. Try to move the emotional needle.
Talk in positive terms about the way the name makes you feel, and the connotations it brings to your mind. Maybe the warmth of your emotional reaction can help thaw his own. You might also think about Eleanora, a classic variant that some men prefer.
Please don't press too hard, though. As much as you love Eleanor, the ultimate goal is a name that warms both of your hearts. If he just can't feel that for this name, you may have to move on.