How did Estonia get its name?

One theory is that the modern name of Estonia originated with the Roman historian Tacitus, who in his book Germania (ca. 98 AD) described a people called the Aesti.

On the other hand, ancient Scandinavia sagas refer to a land called Eistland, close to the Danish, German, Dutch, Swedish and Norwegian term Estland for the country. Early Latin and other ancient versions of the name are Estia and Hestia.

Esthonia was a common alternate English spelling prior to independence.