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Greetings,
Here's the information we found on the name "Criosaidh."
Unfortunately, this is a modern Scots Gaelic name. It's a Gaelic spelling of the name "Chrissie" (1) and we have no reason to think that it was used as a medieval name.
If you're looking for a medieval Gaelic name, we certainly have resources to help you. Many Irish Gaelic names were also used in Scotland, so Irish resources can be helpful. We also recommend that you read our introduction to Scottish names, which can be found at
http://www.stanford.edu/~skrossa/medievalscotland/scot_names_101.html
Tangwystl verch Morgant Glasvryn and Effric neyn Kenyeoch vc Ralte contributed to this letter.
We hope that this has been helpful, and that we can continue to help you.
In service,
Alan Fairfax
Academy of S. Gabriel
(1) Morgan, Peadar. "Ainmean Chloinne - Scottish Gaelic Names for Children."