Clan members or interested viewers who wish to research the option of genetic testing to determine their Y-DNA signature, can join the Clan project found at Family Tree DNA (FTDNA).
This form of testing will allow you to determine which of the various ancient male lines of Mullan or McMullan (plus all variants) you descend from.
Clan DNA project at FTDNA is titled Mullen-McMullen.
Type the project word Mullen into the surname search box, then select the Mullen-McMullen option.
Clan members who have already DNA tested and require assistance in interpreting their result can contact: firstname.lastname@example.org