Populations with more than 30% Rh- Rhesusnegative.net 4 weeks ago I recently posted: 5 Populations with more than 30% Rh- Did I forget something? No. Well… At least not intentionally: Only around 17% of Ireland is Rh negative Significant Rh- frequency variants within the island of Ireland More than 27% of Northern Ireland is Rh- Dál Riata was a Gaelic kingdom that encompassed the western seaboard of Scotland and north-eastern Ireland.