I don't think I've ever had a ticket with my name on it. Your name gets printed on the card with the tickets but not the ticket itself
Last time we were at Wembley I ended up being given a different ticket to what I'd ordered. It happens occassionally. If I'd picked up three tickets having not paid for them all I'd be sweating pre-match. Hopefully there'll be three tickets still sat in the box office before kick off and the details will match the three people in your seats. If not, and they get ejected or nicked then no-one would lose any sleep over it.
Glad you got sorted btw