The surname might be in the original script. I have a copy of the script for "Ghost Light" and the dramatis personae has the full names of most of the characters, with the exception of Ace and Gwendoline, so maybe her name is fully listed there? I checked Tardis Wiki and they don't mention her last name in their cast list, but then they don't include full names in the lists, even when the article about the episode mentioned one previously.
On a whim, since there are few fics with Ray in them, I looked through them all and the first one to mention her surname is "Anaml lles o rodio'r nos by john_amend_all, so maybe he knows where it comes from. :)
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Date: 15 Aug 2023 19:42 (UTC)On a whim, since there are few fics with Ray in them, I looked through them all and the first one to mention her surname is "Anaml lles o rodio'r nos by