It does seem odd to me that he would use the word "conjure" specifically, which, to me, indicates that Harry could be summoned in some fashion (assuming the D&D school of conjuration magic terminology applies).
I don't think you can conjure mortals.
Harry and Bob mention with some frequency that mortal concepts of names aren't all that reliable, because we're constantly redefining ourselves. I could take it to mean that either A) a name written in a book, rather than from someone's own lips, isn't particularly useful for magic, and might have disastrous consequences if you tried to use it, or B) Harry's mortal mutability has decreased enough that his name is effective.