The story
The likely original source is Irish Baile Uí Mhornáin, 'Ó Mornán's town'. Another source is from the Earl of Mornington in the Irish Peerage, e.g. in Victoria.
Etymology from Wiktionary, CC BY-SA 4.0.
Mornington
Today it means: A coastal village in County Meath, Ireland. Full definition →