For as long as I can remember, I've known names had meanings. I don't think I truly understood what that really meant for a while (I think I remember thinking that there was a specific 'name language' or that names just got tagged with meanings), but at around 8, I think I figured it out. In the Bible, it occasionally mentions the names of people and what they meant, (for example,
Genesis 29:31-30:24, when
Rachel and
Leah are naming their sons), and I think that's where I first encountered the idea.