I have been using the handle, Dunrobin Macdhai, online for the past couple of decades, but the name originated years earlier than that. Back in the 1970s I got interested in the Society for Creative Anachronism (SCA), which is a group that re-creates medieval culture for fun. When I got out of the Army in 1975 and moved to western New York, I tracked down the local group for the Buffalo area, and through them I met my best friend, Brian.
Brian was the group’s resident Celt, and since I’m of Scottish ancestry I decided to join his “household.” (A group’s status rises as it’s leader gains more followers.) In the SCA you develop a medieval persona, so I decided on a old-style Scottish Highlands parson (sort of a very secular priest) whom I dubbed “Dunrobin Macdhai.” Dunrobin is an old Scots Gaelic name which means Robin’s Hill or Fort (see Dunrobin Castle, for example,) and I took the Macdhai from my own clan history. (The Davidsons were known as Clan Dhai back in the 13th or 14th century.)