Hi Carly, welcome to the forum & website.
I see from this site's Parish Records there were quite a few "William Rickards" over the years, please can you try and clarify which one you mean, eg approximate dates and location ?

Perhaps you've already found him by searching the PRs, see
https://forest-of-dean.net/joomla/index.php/parish-records-search

Have you read these old forum threads which may refer to the same William you're looking for ?

https://forum.forest-of-dean.net/index.php?id=30772

https://forum.forest-of-dean.net/index.php?id=31496

We look forward to your reply, and to hopefully helping you. The more you can tell us about your Nan's background then the easier and quicker it is for us to maybe tell you something new, and without anyone wasting time revisiting old ground.

Thanks.