The introduction of Christianity among these Gaelic tribes added another class of names to these older forms. These were formed by prefixing the words _Maol_, that is, bald in the sense of tonsured, and _Giolla_, or servant, first to the words _Iosa_ or Jesus, _Criosd_ or Christ, _Faidh_ the prophet, _Easpuig_ the bishop; as in _Maoliosa_ or _Giolliosa_, servant of Jesus, _Maolanfhaidh_ or _Gillanfhaidh_, servant of the prophet, _Giollachriosd_, servant of Christ, and _Gilleaspuig_, servant of the bishop: and secondly, to the names of the founders and patron saints of the churches, as in _Maolcoluim_ or _Giollacoluim_, servant of St. Columba; _Maolbride_ or _Giollabride_, servant of St. Bridget; _Giollachattan_, servant of St. Cathan; _Gillanaemh_, servant of the saints; _Giollaeoin_, servant of St. John, etc. In these latter names, when combined with the word Clan or Mac, if they commence with a consonant, the prefix _Giolla_ is usually omitted, as in Clanchattan, MacCallum, etc.; but if they commence with a vowel, they form that numerous class of names in which Mac is followed by the letter L. Thus _MacGiollaeoin_ becomes Maclean; _MacGiolla Adomnan_, MacLennan, etc. The conquest of the Western Isles, and the frequent occupation of parts of the mainland by the Norwegians and Danes, and the intermarriages between them, added to these forms, after the ninth century, Norwegian and Danish names, such as Godfred, Harald, Ragnall, Somarled, etc., which became _Gofraidh, Aralt, Ranald, Somhairle_, in the Highland Genealogies. It must not, however, be overlooked that the Norwegians frequently gave to Gaelic names a Norwegian form significant in their own language, as Dungadr for _Donnachaidh_, Griotgardr for _Gregair_, Melkolfr for _Maolcoluim_, etc. [Sidenote: Original importance and position of Clan pedigrees.]