Found the following curious court deposition record (Oxford), dating to January 1621.
Apparently DOWNHALL was used by a John WHITLEY as an alias surname.
"Sir Rowland LACY, knight v. Gilbt. JOYNER, John ATHERTON, Robert BOX, Philip TAPLIN, John WHITLEY alias DOWNHALL, John HALL, Thos. SHERLEY, John BOX"
RE: Hundred of Chadlington, held by plaintiff of the Crown, at a fee-farm rent of 5l. 10s.
Touching payments of rents and duties made by the inhabitants of the town of Churchill to the several owners of the hundred. [Sir Edwd. UNTON, Knt., and the Countess of Warwick his wife, Sir Henry Unton, Knt., Sir Anthony COPE, Knt., and Sir Wm. Cope, Knt., formerly consecutive owners of the hundred in fee-farm, are mentioned.]
[Source: Records of the Exchequer, and its related bodies, with those of the Office of First Fruits and Tenths, and the Court of Augmentations; Records of the King's Remembrancer; Exchequer: King's Remembrancer: Depositions taken by Commission, under James I]