WEIR would be a family name - but that's obvious

Church of Latter Day Saints do have possible sibling? listed

Elizabeth WALKINSHAW - 27 April 1790 (birthdate 22 April) Carnwath, Lanarkshire - parents James WALKINSHAW & Elizabeth WEIR

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(Lanarkshire seems to be a popular surname in this County looking at census returns)

Looking at the baptism of John & Harriet's children - one of his first son's is named James and he also has a daughter Elizabeth.