Kathy, I have responded direct by email with background information.
Advice I have been given by an historian in Scotland (in 1992) was that the surname would most likely have originally been ‘Hyndshielwod’, a toponymic (place name) that meant “Wee croft (farm) at the back of the woods”.The location was in an area roughly equidistant from Glasgow & Edinburgh & to the south, just near the village of Forth & on a small watercourse with the name “The Mousewater”.It is currently known as Henshilwood.
The historian’s advice to me was that Scottish surnames were probably registered several hundred years ago (1600’s probably) by better educated Englishmen.They would have had some difficulty understanding & recording correctly what the broad Scottish accented person was telling them.You can imagine how they would have interpreted & documented Hyndshielwod, hence the seemingly endless variations.Most common nowadays seems to be Henshelwood/Henshilwood/Hinshilwood.
In support of the advice from the historian, I discovered the first map of Scotland, of around 1654, referred to a place named ‘Hyndshelwod’, in the same location as the current Henshilwood.
Other variations that I discovered in 1992 during a couple of days at the Library in Edinburgh looking through documents dating back to 1490 are: Hanshillwood, Heindshelwood, Hinchelwood, Hinchillwood, Hendshelwood, Henschelvod, Henschelwod, Henschelwood, Henschellvod, Henschellwod, Henshellwood, Henshelwood, Henshilwood, Hindshielwood, Hinschellwod, Hinschelwood, Hinschelwod, Hinschillwood, Hinschilwood, Hinsellwood, Hinshellwood, Hinshellwod, Hinshelwood, Hinshwood, Hundschielwod, Hundshelwood, Hundshilwood, Hunschielwod, Huntschelwod, Hynchelwod, Hyndshielwood, Hyndshelwod, Hyndshelwood, Hyndshilwood, Hynschelwod, Hynshielwood.