Flip the switch,
I killed one with a lump of wood, beat it around the head. I felt really bad about that, it just sat there looking at me almost smiling, I have felt bad about that for the last 20 years. There is a lady somewhere, who sits quietly, and lets the rats come over to her, they get friendly because She moves slowly and feeds them on grain, then she picks them up gently and puts them into a box, and they are taken miles away and let go. She does this for a profession,She gets clients in bread making factories where they cannot dare put poison down in case it gets into the bread. I saw this on telly, quite worrying, as rats carry all sorts of diseases. I suggest, that as rats love maize, you get some maize from the pet shop, get a cat carrier, put the maize inside, sit and wait, and when ratty goes in, shut the door, then take it miles away ( not outsi de my house, thank you) and let it go. About the name, some bloke I knew used to say " I'll never forget old wos is name"
Good luck, get him before his family move in.