Wellesley, of Old English origin, was once a surname derived from the location Wellesley Hall in Somerset. It has since transitioned to being used as a given name, particularly for males. The name gained prominence due to its association with notable figures like Arthur Wellesley, Duke of Wellington, who played a significant role in the Napoleonic Wars.
The name Wellesley has seen a steady increase in popularity over time, with the number of births fluctuating between five and eight annually from 2015 to 2023.