Why are condoms called jonnys?

The term "Johnny" as a slang for condoms is believed to have originated in the UK, potentially derived from the brand name "Johnny" or "Johnny's," which was popular in the past. The usage of the name may also be linked to the idea of "Johnny" as a common male name, making it a colloquial and approachable term for a product associated with male sexuality. Over time, it has become a casual way to refer to condoms in certain regions.