Llewellyn's middle name, St Vincent, came from his great-grandfather James St Vincent Saumarez, 4th Baron de Saumarez, and originally commemorated the friendship between James Saumarez, 1st Baron de Saumarez, and John Jervis, 1st Earl of St Vincent.
Llewellyn's middle name, St Vincent, originated from his great-grandfather James St Vincent Saumarez, 4th Baron de Saumarez, and was initially a tribute to the friendship between James Saumarez, 1st Baron de Saumarez, and John Jervis, 1st Earl of St Vincent.