Looked for this question here, and saw suggestions for implementation, but not anything that directly answers the question "Is it appropriate to thank someone by name in the comments of an answer?"
In my specific case the area where (s)he was help is pending deletion.
I did so by doing this
[Name](link_to_profile/batch) with a short attribution.
update: As requested, here are... The Specifics
And here is the 'frozen in time' graphic proof...