Kingston, Earls of

Anna King, Alister Kingston (lineage The Earls of Kingston and Viscount Kingsborough), Leighton Kingston (lineage The Earls of Kingston and Viscount Kingsborough John Kingston(lineage The Earls of Kingston Viscount Kingsborough)
Why the differences?

Some members of such families change their surnames to reflect the family titles of their ancestors:
Reply to Joan's message:
Anna King, Alister Kingston (lineage The Earls of Kingston and Viscount Kingsborough), Leighton Kingston (lineage The Earls of Kingston and Viscount Kingsborough John Kingston(lineage The Earls of Kingston Viscount Kingsborough