Jeremy Corbyn is from an old cockerney family. The family name was Corblimey, an old Jewish name. Upon starting his politcal career as a zampolit for the KGB it quickly became apprent that this was too kosher a name for a budding antisemite like him, so he Russocised it to Corbynski.
Comrade Cornbynski had been working as an adviser to the woosy lightweight Idiot Amin at Entebbe Airport, when he was lucky to escape with his life following the famous raid by the Sayeret Matkal. Now wanted by the Kidon, who never forgive or forget, Corbynski fled to the UK, wherehe anglicised his name to Corbyn and was hired as head of the labour party as a prank by Michael Foot.