Mooncrest,
Yes, it’s the ICAO ICARD database.
From memory (it’s been a few years ago since we chose MAXIT/MODMI, GOGSI/GASGU and UMLAT/ULTIB), you get a list of about 40 ‘valid’ names. You get to choose from them or you can run another search and get another 40.
I don’t think you can say ‘I want XXXXX, is it valid?’.
See here…
https://www.icao.int/NACC/Documents/...nes%202020.pdf