Jekyll is a Cornish and Breton family name.World Wide Words "Juggins" It is commonly pronounced , although the traditional pronunciation is . Notable people with the surname include:

Dame Agnes Jekyll (1861–1937), British artist, writer and philanthropist Gertrude Jekyll (1843–1932), British gardener Sir Joseph Jekyll (1663–1738), British lawyer, politician and judge Olga Jekyll (1918–2014), New Zealand fencer Walter Jekyll (1849–1929), English clergyman, brother of Gertrude

Fictional Dr Henry Jekyll, fictional character from the novel Strange Case of Dr Jekyll and Mr Hyde

The modern Breton form is Gicquel (fr). References