A lauguage that means "peope of the coast"

Swahili

Explanation:

the swahilicoast located along the shores of East Africa, was a region where, from the 8th century CE Africans and Arabs mixed to create a unique identity, often referred to as the Swahili culture. Swahili, which is also the name of the people's language, is often referred to as the "Swahili coast".