Tango has 4 tags (2 plastic, 2 stainless steel) for various collars and a harness. She also has 2 embroidered collars. All of which have her name on them. The others have 1 tag each and Morgan also has an embroidered collar, again, all have names.
I always include their name. If my dog is close to someone that they can read the tag information, whether she has a name on her tag or not, if that person wants to keep her there is no doubt in my mind that they will. A new name is easily taught to a dog and who in their right mind would keep a dog, knowing full well that they have a home and call it by it's original name? If I put up signs that said "Missing Dog, responds to the name Tango" along with a photo and that person's neighbour or friend happened to see a poster, they'd know that that was my dog and hopefully have the decency to call me. That's just my opinion. Either way, even if the person had decided to keep her name atleast it would be one thing familier to her. I don't see any reason for a nmae not to be on a tag.
Besides their name, they also have my city/province aswell as my home phone number on their tags. I prefer not to put my address, and I don't have a cell. If I did have a cell, that number would be on it in place of my home phone number.