If you're thinking of a specific Welsh name, please provide the full name, and I can help you with the pronunciation.
For example:
* "Cri" as a shortened version of "Cristan": This would be pronounced "KRIS-tan".
* "Cri" as a shortened version of "Cristopher": This would be pronounced "KRIS-toh-fer".
Please clarify the full name you're interested in, and I'll be happy to help you pronounce it correctly.