Low tide natural bridges are fascinating. The first time I realized they were a thing was when I saw the low tide bridge to Salt Island in Gloucester, MA [0]. The broomway seems much more treacherous though!
I suspect that might be a coincidence - the Gaelic name for Loch Ness is Loch Nis with the origins of the "Nis" being a bit unclear. Neither Loch Ness, River Ness or Inverness seem very peninsula like - although Caithness does use 'ness' in that sense but it was under Norse control for a long time but it is a broad peninsula...
[0] https://www.flickr.com/photos/7831824@N04/35684974504