Cillian

Killian or Cillian, as a given name, is an Anglicized version of the Irish name Cillín. Killian is the more radical anglisation of the name as there is no 'K' in the Gaelic alphabet.
Killian, as a surname, is found in both Ireland and Germany. It was originally spelled Ó Cillín in Irish before being Anglicized into Killeen as well as Killian. Spelling variations for Killian include Kilian, Killion, and others.
The name is said to derive from Saint Kilian, an Irish missionary to Germany in the 7th century, who, according to the Acta Sanctorum, was born in Mullagh, County Cavan, Ireland C.640. He departed for his mission to the continent with 12 Apostles from Kilmacologue in the parish of Tuosist, County Kerry, Ireland. In 689 he was martyred in Würzburg, Franconia, Germany and subsequently became the city's patron saint.
The most likely meaning of the name is "little church", a reference to someone prayerful or spiritual, cill meaning "church" in Gaelic while the suffix "-ín" is used affectionately to indicate a 'pet' or diminutive status. The Rev. Patrick Woulfe wrote that Cillian is the 'pet' diminutive of Ceallach which means "war" or "strife".

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Pet form of the Irish Ceallach, means: war, strife, or church. Probably from Gaelic ceall (church) with a diminutive suffix.

Kilian, Killian

Popularity	Name	Birth Year	Description
1	Cillian Murphy	1976	Irish actor
2	Cillian Sheridan	1989	Footballer
3	Cillian O'Connor	1992	Gaelic footballer
4	Cillian Vallely		Irish musician
5	Cillian Buckley	1992	Irish hurler
6	Cillian Willis	1985	Irish rugby union player
7	Cillian Lordan	1982	Irish footballer
8	Cillian Twomey
9	Cillian Farrell	1977	Irish hurler and Gaelic footballer
10	Cillian Ryan