Does anyone know of the earliest date and the author that used the spelling "Magick" in Books?

Question

No, it was not Aleister Crowley.

I'll give the date and later probably place some of the books on the table.

1651

Answer 1

Derives from the word Magi / Magus, to do of magi-ck.
k = khu, egyptian symbol for magical force.
Heinrich Cornelius Agrippa., de occulta philosophia, book III, 1509-1510

Answer 2

I don't know, but you might have better luck in the literature section. I remember seeing a lot of words from medieval literature ending in ck which now end in c. Yes, these people have revived that little affectation because they think it looks authoritative or scholarly. I've seen similar conventions in the naming of communities, like the superfluous e, as in "Compass Pointe." It's just people putting on airs.

Answer 3

I'm not sure of the earliest date and author, but the spelling "magick" is archaic. Meaning, it was used hundreds of years ago before it was more popularly replaced with "magic".

Answer 4

there's this thing

http://www.esotericarchives.com/agrippa/agrippa2.htm

but i'm not sure he actually wrote in english or it was a translation from latin. it's sort of the end of latin and beginning of the use of vernacular for "serious" texts