To chase the last reference, the one where it says “see Don 1 c ”, the OED provides this at that entry:
Don /dɒn/, sb.1
Etymology: a. Sp. don :– L. domin-um [sic: that’s the accusative; should be dominus in nom. sg. or even domine in the vocative, since that’s how it is often used. ―tchrist] master, lord.
1. A Spanish title, prefixed to a man’s Christian name.
c. [. . .] Don Quixote, the hero of a Spanish romance by Cervantes, who, from his attempt to be a knight-errant as described in the books of chivalry, has become the type of any one who attempts to do an absurdly impossible thing or to carry out an impossible ideal; also attrib.; hence, Don Quixote v., Don Quixotism: see also quixotic, etc.
- 1674 [Z. Cawdrey] Catholicon 18 ― The furious zeal of persons Don-Quixotted in Religion.
- 1734 Fielding Don Quixote in England Introd., ― The Audience, I believe, are all acquainted with the Character of Don Quixote and Sancho. I have brought them over into England, and introduced them at an Inn in the Country.
- 1870 D. G. Rossetti Let. 15 Mar. (1965) II. 817 ― He is a complete Don Quixote in every way.
- 1900 A. Conan Doyle Gt. Boer War x. 167 ― His long thin figure, his gaunt Don-Quixote face.
- 1902 Pall Mall Gaz. 4 Jan. 6/3 ― This Don Quixote of a society has made an assault upon the most solid of windmills.