Here is a random selection of famous first names beginning with J.
James Grover Thurber
(1894 - 1961), American humorist, cartoonist and essayist. His most famous story is "The Secret Life of Walter Mitty".John Brown
(1800-1859), an opponent of slavery in America. He was hanged for inciting slaves to rebel.John Buchan
[1st Baron Tweedsmuir], (1875-1940), Scottish
novelist, statesman and historian. He wrote many books, including 'The 39 Steps'. In 1935 he was appointed governor-general of Canada).John Milton
(1608 - 74), English poet. His most famous prose work is the tract "Aeropagitica". The poem "Paradise Lost" is considered to be his masterpiece.Joseph Banks
[Sir], (1743 - 1820), English botanist and explorer.
He sailed with Captain Cook on his 1768-71 voyage round the world as a representative of the Royal Society. On that trip he discovered many new species of animals and plants.