Definition of "surname"

Barsabas (whose syrname was Iustus).

1526, [William Tyndale, transl.], The Newe Testamẽt […] (Tyndale Bible), [Worms, Germany: Peter Schöffer], Acts j:]

My sirname is Peace-Maker, one that is but poorely regarded in England.

1590, Richard Harvey, Plaine Percevall the peace-maker of England, Sweetly indeuoring with his blunt persuasions to botch vp a reconciliation between Mar-ton and Mar-tother, B3

To his sur-name Coriolanus longs more prideThen pitty to our Prayers.

c. 1608–1609 (date written), William Shakespeare, “The Tragedy of Coriolanus”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene iii], line 171

I have before declared that Baal was the Sun, and Baal Peor, a sirname, from a particular place of his worship.

1638, Abraham Cowley, Davideis, section IV

In late yeeres Surnames have beene given for Christian names among vs, and no where else in Christendom.

1605, William Camden, Remaines, I 32

The Norman Conquest...brought with it the novelty of family nomenclature, that is to say, the use of hereditary surnames.

1876, E. A. Freeman, The History of the Norman Conquest, V xxv 563

The surnam and nerrest of blude to the said Williame.

1455 in J. D. Marwick, Charters of Edinburgh (1871), 79

“Lord,” said Sir Launcelot, “I am hight Launcelot, and am surnamed ‘He of the Lake.’”

1905, Howard Pyle, “The Story of Launcelot”, in The Story of the Champions of the Round Table‎, New York: Charles Scribner's Sons, page 66