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Greetings,
Here's the information we found on your name "Killian McInnes."
The spelling of the name you found is an Anglicized form of the original Gaelic name. These forms developed well after the 8th century, so we're only going to look at the Gaelic form of your name that would have been used in the 8th century.
St. Kilian was an Irish missionary who was bishop of Wurzburg, Germany. There is some question about the original Gaelic form of his name, but our best guess is that it was "Cillíne." It's possible that the original form was "Cellán." Either of these would be appropriate for your period. We found both of these names in Ireland, but not in Scotland--although Gaelic was the common language of both countries at this time, we can't be sure that a name used in Ireland was also used in Scotland.
The 8th-century Gaelic form of "McInnes" would be "macc Oingusa" (a later-period, and more familiar, form of this name is "mac Aonghius.")
So the most appropriate 8th-century form of your name would be "Cillíne macc Oingusa."
Talan Gwynek, Tangwystl verch Morgant Glasvryn, Pedro de Alcazar, and Arval D'Espas Nord, and Lindorm Eriksson contributed to this letter.
We hope this has been helpful, and that we can continue to assist you.
In service,
Alan Fairfax
Academy of S. Gabriel