Bregret

The story

1. Ancient GreekΒρεττᾰνός (Brettănós)
2. Ancient GreekΒρεττανία (Brettanía)
3. LatinBritannia
4. Anglo-NormanBritaine
5. Middle EnglishBritayne
6. EnglishBritain
7. Proto-Indo-European*h₁éǵʰ
8. Proto-Indo-European*h₁éǵʰs
9. Proto-Italic*eks
10. Latinex
11. Latinex-
12. Latineō
13. Latinexeō
14. Latinexitus
15. Middle Englishexit
16. Englishexit
17. EnglishBrexit
18. Proto-Italic*wre-
19. Latinre-
20. Old Frenchre-
21. Proto-Indo-European*ǵʰreh₁d-
22. Proto-Germanic*grētaną
23. Frankish*grātan
24. Old French*greter
25. Old Frenchregreter
26. Middle Englishregretten
27. Englishregret
28. English todayBregret

Blend of Brexit + regret.