Historically, there are several instances of the word spelt with a double-d over a long period.
… the carpenter's man had a great iron laddle with which he used to supply the workmen with hot stuff, and as two of the enemies entered the boat where the fellow stood, he saluted them with a full laddle of the hot boiling liquor …
(Daniel Defoe, "The Life and Most Surprising Adventures of Robinson Crusoe … The Ninth Edition.," A. Donaldson, 1769)
The Carpenter's Man had a great Iron Ladle, with …
(The Fourteenth Edition., J. Browne, 1779)
Note the change to single-d in the latter edition.
- "Wills and Inventories Illustrative of the History, Manners, Language, Statistics, &c. of the Northern Counties of England, from the Eleventh Century Downwards.," Part I., London, p.307.(The quotation dates to 1569)
- "251. To Make CREAM CURDS" in Elizabeth Moxon, English Housewifery Exemplified in Above Four Hundred and Fifty Receipts Giving Directions for Most Parts of Cookery, Library of Alexandria, 1755.
- Andrew Duncan (Jr.), "The Edinburgh New Dispensatory …" Bell and Bradfute, 1819, xc.
- Matthew Prior, "Poems Upon Several Occasions," Vol.1, Kincaid and Creech, 1773, p.128