Brexit

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. English todayBrexit

Blend of Britain + exit, formed by analogy with Grexit. According to the Oxford English Dictionary, the earliest attested use of thsi word is on 15 May, 2012 in a Euractiv blog post by Peter Wilding titled “Stumbling towards the Brexit”, formed by analogy with Grexit, coined on 6 February 2012.