Where does “honourific” come from?

honourific (English) comes from English -ific, from Latin -ficus, from Proto-Italic -fakos — -making, -producing.

Ancestry of “honourific”, step by step

StepLanguageWordMeaning
1English-ificCreating or causing something; Very; extremely;...
2Latin-ficusForms adjectives that denote bringing or making
3Proto-Italic-fakos-making, -producing
Every word from Proto-Italic -fakos →Every word from Latin -ficus →Every word from English -ific →
honourific — Etymology, Origin & Word History | Etymology Explorer