Their son, the third Baronet, assumed by Royal licence the additional surname of Grattan.

In 1852, he and his father assumed by Royal licence the surname of Tyssen-Amhurst.

In 1769 he assumed by Royal licence the additional surname of Arundell.

In 1787 he assumed by Royal licence the additional surname of Olmius as a mark of respect for his father-in-law.

In 1892 he assumed by Royal licence the additional surname of Temple.

In 1774 he assumed by Royal licence the additional surname of Corry.

In 1807, Lord Powis assumed by Royal licence the surname and arms of Herbert.

In 1831 he assumed by Royal licence the additional and principal surname of Douglas.

In 1888, on succeeding to the estates of his maternal uncle, he assumed by Royal licence the additional surname of Poynder.

In 1767 he assumed by Royal licence the additional surname of Bruce.