Why is a venn diagram called a venn diagram?

Answer 1

Named for its inventor, or at least its popularizer. Similar visual tools are known as Euler's circles.

Answer 2

A Venn diagram is named after British logician and philosopher John Venn, who introduced the concept in the late 19th century. Venn diagrams are used to visually represent the relationships between different sets or groups of data.

Answer 3

John Venn developed the diagrams named after him while lecturing at Cambridge University in the 1860's.