The name Dean originates as a surname derived from location names, which utilize the Old English ?denu? meaning ?valley,? often associated with any who lived in or near a valley. Additionally, surnames stemmed from the Middle English ?deen? meaning ?dean? and the Old French ?deien? meaning ?dean,? deriving from the Latin ?decanus? meaning ?chief,? from the occupation of leading a church related group endeavor. Therefore, Dean is associated with meaning ?church official.? It is also the occupational name of one who heads an academic department.
July 1st is celebrated by Slovakia in honor of the name Dean.
http://wiki.name.com/en/Dean