Wiki says
"Mountbatten is the family name originally adopted by a branch of the Battenberg family during World War I because of rising anti-German sentiment among the British public. On 14 July 1917, Prince Louis of Battenberg ("Prince Louis I") assumed the surname Mountbatten."
The Mountbatten blown up by the IRA had a career full of absolutely awful decisions. The most notable concerned his handling of the India/Pakistan Partition. Also the WW2 Dieppe raid was his idea and a disaster. He is also known as Prince Charles' Mentor - another disaster! Canadians hated him for the massive losses of their troops on the Dieppe Raid.
His meddling in the TSR2 debacle didn't help matters either.
Mountbatten's self publicity hid the many gaffs but historians have shown the reality of a rather mediocre career that cost many lives.