Cillian is a traditional Irish name that means "battle" or "strife." It is a strong and masculine name that exudes power and determination. People with the name Cillian are often known for their intelligence, charisma, and leadership abilities. They are natural born leaders who are able to inspire and motivate those around them. Cillian is a name that carries a sense of mystery and allure, making it a popular choice for parents looking for a unique and impactful name for their child.