Where does the name of the UK county 'Essex' originate from?

The name Essex originates in the Anglo-Saxon period of the Early Middle Ages and has its root in the Anglo-Saxon (Old English) name Ēastseaxe ("East Saxons"), the eastern kingdom of the Saxons who had come from the continent and settled in Britain. Excavations at Mucking have demonstrated the presence of Anglo-Saxon settlers in the early fifth century, however the way in which these settlers became ascendent in the territory of the Trinovantes is not known. Studies suggest a pattern of typically peaceful co-existence, with the structure of the Romano-British landscape being maintained, and with the Saxon settlers believed to have been in the minority.

The name Essex originates in the Anglo-Saxon period of the Early Middle Ages and has its root in the Anglo-Saxon (Old English) name Ēastseaxe ("East Saxons").