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When the Saxon invaders came to this country in the fifth and sixth centuries they brought with them their own language. Although they did not kill all the native Britons they did almost destroy their language and replaced the native 'Celtic' language with their own 'Germanic' tongue. With the new language, of course, came new place names, many of which survive to the present day. The existing settlements were not destroyed, but the Saxons found the names difficult to pronounce, so they renamed them in their own language.
Few Viking women appear to have had nicknames, and most of those that did described the woman's wisdom, beauty, wealth or speech habits. (Perhaps the less complimentary names never made it into the sagas, for fear of litigation of the physical sort?)