Where does “includeth” come from?

includeth (English) comes from English include, from Middle English includen, from Latin inclūdō, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

includeth (English): third-person singular simple present indicative...

Definitions

  1. third-person singular simple present indicative...

Ancestry of “includeth”, step by step

includeth traces back through two separate lines of ancestry.

via English include

StepLanguageWordMeaning
1EnglishincludeTo bring into a group, class, set, or total as a (new) part or member
2Middle Englishincluden
3Latininclūdōto shut up or in, confine, enclose, imprison, keep in
4Latinīn-un-, non-, not
5Latinînin, at, on, upon, from (space)
6Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
7Proto-Italicenin
8Proto-Indo-Europeanh₁énin

via English eth

StepLanguageWordMeaning
1EnglishethA letter introduced into Old English to...
Every word from Proto-Indo-European h₁énEvery word from Latin īn-Every word from Proto-Italic en