You've got a day job... right Ederfay? ::ducks::

I dont think -bogie names in gaelic scotland have anything to do with boggarts, but I could be wrong...

Here's a book about the area around Strathbogie in the internet archive. Some older books get stuff wrong, but they are quaint... this one has archaeology and extra stuff like that, not just place name meanings.
http://www.archive.org/stream/placenamesinstra00macd#page/n7/mode/2up

This one has: Strath Bogie, Strathbogie. Valley of the Bogie. Srath,
alluvial flat valley; bogain, gen. of bogan, quagmire, burn
draining a quagmire.

http://www.archive.org/stream/celticplacenames00miln/celticplacenames00miln_djvu.txt

(Bogle would be more appropriate search maybe, an english loan word though, as in:
Bogle Den. Den of the ghost. Bogle(English)spectre)