Duncan McLean/Elizabeth(Betsy) Mclauchlan c1800

Duncan McLean and Elizabeth Mclean, (Mc Lauchlan) lived in Campbeltown, Kintyre at the time of the 1841 census

Flemings land Campbeltown

Duncan McLean labourer Ireland 55
Elizabeth McLean 40
Andrew 18
Catharine 12
Margaret 10
Hugh 8
Elizabeth 6 all these born in Ireland
Martha 3 born Argyllshire
Christiana 9m
Agnes Miller 20 female servant Ireland

Son Charles is listed in another household as from Argyllshire, but later he is head of household and from Ireland.
Duncan seems to have been a carter at some point in his life.

It looks as though they made the crossing to Kintyre about 1838, which may have coincided with the poor relief laws and the decline in agriculture.

So far I have found no indication of where they came from in Ireland.
Maybe someone else has come across them and can help?