There is no positive evidence enabling us to decide the question. The derivation of English surnames is apt to be complicated and obscure, and 'Keats' is no exception to the rule. It is a name widely distributed in various counties of England, though not very frequent in any. It may in some cases be a possessive form derived from the female Christian name Kate, on the analogy of Jeans from Jane, or Maggs from Margaret: but the source accepted as generally probable for it and its several variants is the Middle-English adjective 'kete', a word of Scandinavian origin meaning bold, gallant. In the form 'Keyte' the name prevails principally in Warwickshire: in the variants Keat (or Keate) and Keats (or Keates[1]) it occurs in many of the midland, home, and southern, especially the south-western, counties.
Mr Thomas Hardy tells me of a Keats family sprung from a horsedealer of Broadmayne, Dorsetshire, members of which lived within his own memory as farmers and publicans in and near Dorchester, one or two of them bearing, as he thought, a striking likeness to the portrait of the poet. One Keats family of good standing was established by the mid-eighteenth century in Devon, in the person of a well-known headmaster of Blundell's school, Tiverton, afterwards rector of Bideford. His son was one of Nelson's bravest and most famous captains, Sir Richard Godwin Keats of the 'Superb', and from the same stock sprang in our own day the lady whose tales of tragic and comic west-country life, published under the pseudonym 'Zack', gave promise of a literary career which has been unhappily cut short. But with this Bideford stock the Keats brothers can have claimed no connexion, or as schoolboys they would assuredly have made the prowess of their namesake of the 'Superb' their pride and boast, whereas in fact their ideal naval hero was a much less famous person, their mother's brother Midgley John Jennings, a tall lieutenant of marines who served with some credit on Duncan's flagship at Camperdown and by reason of his stature was said to have been a special mark for the enemy's musketry. In the form Keat or Keate the name is common enough both in Devon, particularly near Tiverton, and in Cornwall, especially in the parishes of St Teath and Lanteglos,--that is round about Camelford,--and also as far eastward as Callington and westward as St Columb Major: the last named parish having been the seat of a family of the name entitled to bear arms and said to have come originally from Berkshire.