Isn't
Honi supposed to be written
Honni?
Well, yes and no. In 1348, the spelling was honi. But, like most languages, French evolved and today the double N is the norm in the French language. Henriette Walter wrote a book documenting the 'love story' between the French and English languages. It is aptly named "Honni soit qui mal y pense" (note one of two 'n' is italicized)
Source: http://www.rfi.fr/Kiosque/LangueFrancaise/EntrevueAvec/05032001-0.html interview with Henriette Walter