RootsChat.Com

Still regarding the Farmstead named as Pischinsheuch. This farm may have been named after a swimming area of the Glen Water, Darvel by using the French word for swimming pool and not as it might first appear.
This part of Ayrshire welcomed many Huguenot refugees from France after the Edict of Nantes, took away their freedom of worship. The Earl of Loudoun was instrumental, in providing them sanctuary. The surname Fleming comes from refugees who settled in Southern Scotland, particularly in the 1400s, from the Low Countries. No doubt French words were incorporated into Scots.
The Glen Water and it's tributary, the Pogiven Burn, used to be a popular picnic and swimming area for local people and still are to a lesser extent.

Hello,

The track from Muirhead to the present day road can be seen in the Ordnance Survey map of 1900s. If you select the 1856 25 ins map of Darvel area then opt for the 1900s background map which shows the road in question. Interestingly, the 1920 map shows neither the farm or the track.

The farmstead named as Pissinheugh on Roy's Military Map is shown to be renamed Muirhead on the 1851 Ordnance Survey map. This map can be viewed on nls maps online. A gap in the trees corresponding to the original access road, has been left, presumably by The Forestry Commision.
The reason for renaming the site would appear to be what seems to our generation to be the rough language used. This however was standard language of the time and an associated word, appears in the original King James version of The Bible.