I bought some lovely ones from this E Seller on Vinted that makes them x
These are not personalised but I highly recommend. They're safe in both being only 3 components, and also cotton so can be chewed on by babe and you don't need to worry about choking hazards from beads or plastic chemical leeching. I've found they can easily be cleaned in the washing machine (stick in a bag) and tumbledried, or hand washed and air dried. 😊 https://amzn.eu/d/4v2WA5C
This is a company we used, really good quality too 🙂 https://baebea.com/products/personalised-dummy-soother-clip x