Where does “bog Irish” come from?

bog Irish (English) comes from English Irish, from Middle English Irisce, from Old English Īras, from Old Norse Írar, from Old Irish Ériu, from Primitive Irish *Īweriū, from Proto-Celtic Φīweryū, from Proto-Indo-European piHweryon- — fat, milk.

bog Irish (English): People of low-class Irish ancestry

Definitions

  1. People of low-class Irish ancestry

Ancestry of “bog Irish”, step by step

bog Irish traces back through two separate lines of ancestry.

via English Irish

StepLanguageWordMeaning
1EnglishIrishThe Goidelic language indigenous to Ireland, also...
2Middle EnglishIrisce
3Old EnglishĪrasIrishmen
4Old NorseÍrarIrishmen
5Old IrishÉriuIreland
6Primitive Irish*Īweriū
7Proto-CelticΦīweryū
8Proto-Indo-EuropeanpiHweryon-
9Proto-Indo-EuropeanpeyH-fat, milk

via English bog

StepLanguageWordMeaning
1EnglishbogAn area of decayed vegetation which forms a wet...
2Middle Englishbog
3Scottish Gaelicbogachsoft, boggy ground
4Old Irishbogsoft
5Proto-Celticbuggossoft, tender
6Proto-Indo-Europeanbʰewgʰ-to bend; curve, arch
Every word from Proto-Indo-European peyH-Every word from Proto-Indo-European piHweryon-Every word from Proto-Celtic Φīweryū