Jenny Caroline "Jennychen" Marx Longuet (1 May 1844 β 11 January 1883) was the eldest daughter of Jenny von Westphalen Marx and Karl Marx.
Briefly a political journalist writing under the pen name "J.
Williams", Longuet taught language classes and had a family of five sons and a daughter, three of whom survived to adulthood, before her own death due to cancer at the age of 38.