The name Jenson is a boy's name of Scandinavian origin meaning "son of Jens". Jenson and is often added to lists like Variations of John and discussed in our forums with posts like "My nickname is X, but it's short for Y, not Z".
From the experts:
The surname name Jenson is in the British Top 100 thanks to champion race car driver Jenson Button. Jenson might be an honorific for an ancestral John, the English form of Jens or Johannes, or even Jen.