Douglas-Hamilton is the family surname of the Dukes of Hamilton

Duke of Hamilton

Duke of Hamilton is a title in the Peerage of Scotland, created in 1643. It is the senior dukedom in that Peerage , and as such its holder is the Premier Peer of Scotland, as well as being head of both the House of Hamilton and the House of Douglas...

 and Earls of Selkirk

Earl of Selkirk

Earl of Selkirk is a title in the Peerage of Scotland.It was created on 4 August 1646 for Lord William Douglas, third son of William Douglas, 1st Marquess of Douglas, along with the title Lord Daer and Shortcleuch...

. The name originates from the marriage of Anne Hamilton, 3rd Duchess of Hamilton

Anne Hamilton, 3rd Duchess of Hamilton

Anne Hamilton, 3rd Duchess of Hamilton was a Scottish peeress.The daughter of Sir James Hamilton, 1st Duke of Hamilton and 3rd Marquess of Hamilton, Scottish General and premier peer of the realm, and Lady Mary Feilding, daughter of William Feilding, 1st Earl of Denbigh and Lady Susan Villiers, a...

 to William Douglas, 1st Earl of Selkirk in 1656. Anne was Duchess in her own right and head of the "House of Hamilton

Clan Hamilton

The House of Hamilton, occasionally and erroneously referred to as Clan Hamilton, is a Scottish family who historically held broad territories throughout central and southern Scotland, particularly Ayrshire, Lanarkshire and the Lothians...

". William was a younger son of the Marquess of Douglas

William Douglas, 1st Marquess of Douglas

William Douglas, 1st Marquess of Douglas and 11th Earl of Angus was a Scottish nobleman.-Master of Angus:William Douglas, Master of Angus was the eldest son of William Douglas, 10th Earl of Angus and his Countess, Elizabeth Oliphant, eldest daughter of Laurence Oliphant, 4th Lord Oliphant...

.

Upon the death of a cousin, the Duke of Douglas

Archibald Douglas, 1st Duke of Douglas

Archibald Douglas, 1st Duke of Douglas was a Scottish nobleman.He was the second son of James Douglas, 2nd Marquess of Douglas, by his second marriage...

, in 1761 without heir, his subsidiary titles and the nominal seniority of the "House of Douglas

Clan Douglas

Clan Douglas is an ancient Scottish kindred from the Scottish Lowlands taking its name from Douglas, South Lanarkshire, and thence spreading through the Scottish Borderland, Angus, Lothian and beyond. The clan does not currently have a chief, therefore it is considered an armigerous clan.The...

", were devolved onto the 7th Duke of Hamilton.

These titles are:

Marquess of Douglas

Earl of Angus

Earl of Angus

The Mormaer or Earl of Angus was the ruler of the medieval Scottish province of Angus. The title, in the Peerage of Scotland, is currently held by the Duke of Hamilton.-Mormaers:...

Lord Abernethy and Jedburgh Forest

The Arms of the Head of the House are:

Quarterly; 1st and 4th grandquarters, counterquartered (i) and (iv) Gules,three cinquefoils Ermine (for Hamilton), (ii) and (iii) Argent, a lymphad Sable, sails furled proper, flagged-Gules (for The Isles (Arran)); 2nd and 3rd grandquarters, Argent, a man's heart Gules ensigned with an imperial crown proper, on a chief Azure three stars of the First (for Douglas).