[From HouseofNames.com - http://www.houseofnames.com/xq/asp.fc/qx/Jillian-family-crest.htm] The name Jillian was brought to England by the Normans when they conquered the country in 1066. It comes from the old French given name Guillaume. The name Guillaume was modified into two forms after arriving in England: Gillham and William.
― Anonymous User 2/6/2009
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Possibly originated from medieval English, and there are two popular meanings to this name - "youthful" or "girl".
― Anonymous User 12/29/2008
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