All over Spain there's no shortage of Irish bars - O'Neill's, O'Reilly's, Finnegan's, O'Connor's....
O'Donnell however is not one of them. One stop in the other direction from Manuel Becerra, this Metro station is named for its location on Calle O'Donnell, which in turn is named after this bloke, Leopoldo:
What on earth is an Irishman doing commemorated amongst the famous names of Spain, you might ask, somewhat racistly. Well, it turns out he's as Spanish as paella, tortilla, and siestas. Born in Tenerife in 1809, he was Spain's Prime Minister not once but three times, and gave his name to not one but two barrios of Madrid - O'Donnell, and Tetuán (of which he was Duke).
So what did he do? Well, he led a failed coup, was exiled, returned to favour, was in charge of a brutal repression of Cuba, aggressively pursued imperial expansion, led the army in its invasion of Morocco, foiled a revolt and was finally dismissed by the Queen for brutality. So not an entirely spotless career then, but enough to be remembered, evidently. And his name? He was the descendent of an Irish king no less, but it was his grandfather who first took the O'Donnell name to Spain, after becoming a general in the Irlanda regiment of the Spanish army. Due to their common Catholic beliefs, Irishmen had been fighting for Spain since 1580. The O'Donnells became part of the noble families not just of Spain, but France and Austria as well, and their descendents are still around today.