Technically, you don't need to show valid ID either to the airline or the TSA, but you'll be set for secondary screening. So as long as the other person is of the same sex as the original pax (or the other name could work for them), then you could probably make it without incident.

However, you would be breaking airline rules, so you're on your own if you get caught trying to circumvent them. While said airline rules aren't laws, you agreed to them through the contract of carriage by purchasing the tickets.

If you want the safe way to go, have the airline refund the cost of the ticket minus the fee (last time I did this on AA it was a $100 fee), and have your other friend buy a new ticket.