Name The municipality (originally the parish) is named after the island of Tjøme () since the first Tjøme Church was built there. The name is very old and its meaning is not certain. The name may be derived from the word which means "bridle" or "rope", likely referring to the shape of the island. Historically, the name of the municipality was spelled Tjømø. On 3 November 1917, a royal resolution changed the spelling of the name of the municipality to Tjøme.
Name The municipality (originally the parish) is named after the island of Tjøme () since the first Tjøme Church was built the.re. The name is very old and its meaning is not certain. The name may be derived from the word which means "bridle" or "rope", likely referring to the shape of the island Historically, the name of the municipality was spelled Tjømø. On 3 November 1917, a royal resolution changed the spelling of the name of the municipality to Tjøme.