Throughout the world, Sionainn (Sionainn 
) is an extremely rare feminine first name. Much less frequently, Sionainn is the last name as well as the forename.
Boyle, Hayes, Murphy, Lennon, Willis, Marcoux, Marcout, Mcateer, Karlssen, Kinghan, Mcglinchey, Mclaughlin, and Carmichael