Another 50 percenter here. Dad's side. Irish, the whole lot of them. Also, I'm 25 percent Russian (though German speaking) and 25 percent German. Three reasons to get drunk!
The people who make out that Ireland is awash with redheads have clearly never been to Ireland - a more typical Irish look would be much darker hair, often black.
My Dad has black hair with hazel eyes. Though, his two younger brothers are redheads.