What does the word Carlisle mean?

The word Carlisle means fort of Luel or walled city of Luguvalus, derived from ancient Celtic and Roman origins of place name Carlisle in Cumbria, England. Carlisle name comes from Roman town Luguvalium, meaning fortified town of Luguvalus, a Celtic personal name of chieftain, from Luguvalus. After Romans left, name evolved to Old Welsh and Cumbric Cair Ligualid or Caer Luel, where Caer is Celtic word for fort, walled city, or stronghold, similar to Welsh Caer, and Luel is personal name Luguvalus shortened. So Carlisle means fort or stronghold belonging to Luel. Over time, Luguvalium became Caer Luel, then Carleol in Old English, then Carlisle in modern English. So meaning is geographic place name meaning fortified place of Luel, indicating ancient fortified settlement that became city. As surname, Carlisle means someone from Carlisle city. As given name, Carlisle is English place name meaning from the walled city. In baby name books, Carlisle meaning is given as from the protected tower or from the walled city. So word Carlisle is proper noun with meaning fort of Luel, reflecting its origin as Roman fort and Celtic stronghold near Scottish border, with Caer meaning fort and Luel being personal name, so fortified town.