" 'Boycott' started off as an eponym—that is, a word derived from a name, like 'shrapnel' (from the British Army officer Henry Shrapnel) or 'guillotine' (from the French physician Joseph Guillotin), to take two gory examples.
"In this case the eponymous source was Captain Charles Boycott, an English land agent who managed the Irish estate of the Earl of Erne, an absentee landowner. The Boycott family name was originally 'Boycatt,' from French Huguenots who fled religious persecution in the 17th century.
Note:
(a) Henry Shrapnel https://en.wikipedia.org/wiki/Henry_Shrapnel
(1761 – 1842; a British artillery officer; inventor of the shrapnel shell)
(b) Charles Boycott https://en.wikipedia.org/wiki/Charles_Boycott
(1832-1897; father was William Boycatt; "Charles Boycott was named Boycatt in his baptismal records. The family changed the spelling of its name from Boycatt to Boycott in 1841")