This looks to be William with Wilson McGill, son of Alexander and Elizabeth, in 1891:
Francis McGinn 32 butcher b. St Quivox, Ayr
Jessie McGinn 25
John McGinn 2 1/2
Elisabeth McGinn 8 months
Wilson McGill 28 butcher lodger b. St Quivox, Ayr
Wm McGivens 16 errand boy, lodger b. St Quivox, Ayr
Address: 69 Mill St, Ayr
Monica