Bright-headed or church-associated
Cillian is an Irish name with two primary etymological roots. It is often interpreted as a diminutive of 'ceall', the Gaelic word for a church or monastery cell, but it may also derive from 'cill', meaning bright-headed or war.
Oscar-winning Irish actor known for Oppenheimer and Peaky Blinders
7th-century Irish missionary bishop
Irish professional footballer
US births per 5-year period, 1990–present (SSA data).
