This isn't a dox, or anything too serious, but this youtube channel might be related to theymos of bitcointalk.
A 7 year old channel, which has "theymos" in it's url and channel name. Most videos have a single view. What's interesting though, is that in the description of some videos, the name michael marquardt is included. This is the same name theymos is also known as according to
https://bitcoin.org/en/about-usHere's the link to the channel:
https://www.youtube.com/user/theymos/and an archive of the video in question:
https://archive.is/QPyr8#selection-1500.3-1500.4Now, the video including the name is new, but at least the channel has been named that for at least five years.
Here's an archive of video form the same channel where in old comments people quote the uploader as "theymos"
https://archive.is/4n9A9