My mother-in-law's married surname is LINDSAY, - and it's been spelt that way as far back as I've traced the tree with only the very occasional omission of the "D", i.e. LINSAY.
While waiting for my m-i-l in her sheltered housing complex's common room t'other day I was looking at some photies on the wall from a recent event involving the residents, and was taken aback to see her recorded as "Jean LYNSEY".
OK, putting my professional hat on, I trust that I've have done the necessary background research to establish possible spelling variations if I was tasked with searching a LINDSAY line tomorrow, but it still made me think
David