Anyway, here's a quick hack to show the heuristic:

#!/usr/bin/perl -w
use strict;

for (qw(mcginley macgee develera)) {
    print "$_ => ".handle_caps($_)."\n";
}

sub handle_caps {
    # this assumes irish capitalisation!

    my $name = ucfirst(shift);
    for (qw(Mc Mac)) {  # always ok
        $name =~ s/^$_(.*)/$_\u$1/;
    }
    for (qw(De)) {      # may not be followed by [aoeiu]
                        # ?? don't know enough irish 
                        # for this rule ;-)

        $name =~ s/^$_([^aoeiu].*)/$_\u$1/;
    }
    return $name;
}
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