Kilian

German form and Irish and French variant of CILLIAN.

CILLIAN   male   Irish
Probably from Gaelic ceall "church" combined with a diminutive suffix. This was the name of a 7th-century Irish saint who evangelized in Franconia. He was martyred in Würzburg.
EQUIVALENTS
FRENCH: Kilian, Killian, Kylian
GERMAN: Kilian
IRISH: Cillian, Cillín, Kilian, Killian