PIGSNEY

also pigesnie, piggesneyȝe, pigges-ny, piggesnye, pignie, pig-nye, 
pigseie, pigsney, pigsneye, pigsnie, pigsny, pigsnye, pigsy (dialect), 
pygges nye, pyggysny, pygsnie, pygsnye

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From E-NED: Middle English from pigges pig's + neyȝe, variant of eyȝe, eye with prosthetic n, apparently derived from an eye, min eye; 
probably originating in children's talk and the fond prattle of nurses;
the eye of the pig (as that of a bird in bird's-nie) is taken as a familiar type of a small eye; 
the expression is thus equivalent to pinke or pinkie nye, pinkeny, ‘tiny eye’, 
which was used in the same way as a term of endearment; but early examples showing pigges nye applied to the eye itself (sense 2) have not been found

c 1386 - Miller's Tale, Geoffrey Chaucer;
see below From: Chaucer's Canterbury Tales
Edited by Alfred W. Pollard
Volume I. 1894
Miller's Tale
P. 142

From: The Plays Of Philip Massinger
By W, Gifford
The Second Edition. Volume the Third, 1813
The Picture (1629)
Act II Scene I
P. 144