Country code: +975
Downloadable PDF of the entire Bhutan Phone Book. Sorted by area and then categories including Government, businesses and residential within each area. No specific search engine to find names - only the one inbuilt into the PDF which, if you're looking for a common name, can bring up a lot of results. (1397 Tsherings for example).
Submission based business directory for Bhutan. Limited entries. Search via keyword or category listing.