The conventional way to alphabetize names that start with these prefixes is to treat Mac and Mc the same. Names that start with Mc are treated as though they were spelled Mac. In effect, “Mc” has an invisible “a” between the “M” and “c”.

Where does MC go in filing?

These rules are "letter-by-letter" (or "character by character") rules. They also largely ignore distinctions among different punctuation marks and do not distinguish among the types of access points. In these rules, for example, names beginning with M', Mc, and Mac are filed alphabetically as spelled.

Is MC before Ma?

In addition to sorting them under "Mac" and "Mc" respectively or choosing to sort them both under "Mac", it is known for Mc/Mac names to be placed in separate position before M. ...