Where does “kthxbye” come from?

kthxbye (English) comes from English bye, from Old English bī, from Proto-West Germanic bī, from Proto-Germanic bi, from Proto-Indo-European h₂m̥bʰi, from Proto-Indo-European h₂n̥tbʰi, from Proto-Indo-European h₂énts, from Proto-Indo-European h₂ent- — on, onto.

Ancestry of “kthxbye”, step by step

kthxbye traces back through 3 separate lines of ancestry.

via English bye

StepLanguageWordMeaning
1EnglishbyeThe position of a person or team in a tournament...
2Old Englishbīlullaby!; near, by; by, near, around
3Proto-West Germanicbīby, at; near, around
4Proto-Germanicbiby, at; near, around
5Proto-Indo-Europeanh₂m̥bʰiaround, on either side of, about; in exchange...
6Proto-Indo-Europeanh₂n̥tbʰi—
7Proto-Indo-Europeanh₂éntsforehead; front
8Proto-Indo-Europeanh₂ent-face; forehead; front
9Proto-Indo-Europeanh₂en-on, onto

via English K

StepLanguageWordMeaning
1EnglishKThe ordinal number eleventh, derived from this...
2Englishkilo-API; In the International System of Units and...
3Frenchkilo-kilo
4Ancient Greekχίλιοιthousand
5Proto-Hellenic*kʰehliyoithousand
6Proto-Indo-Europeanǵʰéslomthousand
7Proto-Indo-Europeansm̥-one; with, together
8Proto-Indo-Europeansem-together, one

via English thx

StepLanguageWordMeaning
1Englishthx—
Every word from Proto-Indo-European h₂en- →