Ernle was the surname of an English gentry or landed family descended from the lords of the manor of Earnley in Sussex who derived their surname from the name of the place where their estates lay.
Onomasticians say that the surname's origin, in being drawn from the name of a manor, is topographical in nature, and identical with the place name's origins. As such, it is derived from an Old English compound name composed of earn meaning eagle combined with leah meaning wood. The name's meaning is interpreted as signifying a place to which eagles resort.
The earliest forms noted are Earneleach, Earnaleagh, Earnelegh found in a document dated 780 during the reign of Oslac, duke of the South Saxons. A later form, Earneleia, derives from a charter of England's King Aethelstan dated 930. Other English place names deriving from the same two words are thought to include Earley, Berkshire and Areley Kings (otherwise Areley-on-Severn), formerly called Ernley, Worcestershire. The latter place is connected with Layamon, poet and historian, one of the earliest writers in the English tongue (The Beginnings of English Literature, C.M. Lewis, 1900, p. 66):
About the year 1205 an English 'Brut' was written. This was the work of Layamon, a parish priest of Ernley in Worcestershire. The opening lines give us the best information we have about him. Their metre should be noted. It is a relic of the Old English verse, each half-line (or each line, as here printed) containing two principal accents, and being more or less closely connected with its fellow. The poet, however, often omitted the alliteration; and the scribe, who attempted by marks of punctuation to show which half-lines belonged together, seems in consequence to have sometimes lost his way.
An preost wes on leoden Laȝamon wes ihoten. He wes leouenaðes sone, liðe him beo drihten. He wonede at ernleȝe, at æðelen are chirechen. vppen seuarne staÞe, sel Þar him Þuhte. on fest Radestone Þer he bock radde. Hit com him on mode, & on his mern Þonke.
[translation into Modern English]
A priest was among the people who was called Layamon. He was Levenath's son. Gracious to him be the Lord. He dwelt at Ernly, at a noble church upon Severn's bank. Well there to him it seemed, fast by Radestone. There he read books.