As far as I know our only source for this is the Venerable Bede and he was just another xtian shitwit but he did profess to tell us something of the early Anglo-Saxons.
http://www.angelfire.com/ca6/sunnysweb/ostar.html
http://www.angelfire.com/ca6/sunnysweb/ostar.html
Quote:German pagans named the Spring Equinox after Ostara, their goddess of spring, fertility, and rebirth. In England, among the Anglo-Saxon tribes, Ostara was known as Eostre. The modern holiday of Easter is derived from the name "Eostre" and the associated myths.