I think it was my last trip, I was trying so hard to find this place at Chatuchak. It was mentioned online that you can get personalized/customized engraved tags at Chatuchak. It was one of those things where when you didn’t make any effort to find it, the thing comes to you.
Here’s the place if you had Googled customised tags at Chatuchak. Btw, I gave a little counsel to the owner that they should have their name on Facebook in English for easy searching. Well, at least they have a website I suppose.