Last name Séad (Jade 
, Séad) , in the entire world, is a common cognomen. The cognomen Séad is habitual in Guadeloupe, where it is quite a common surname, Macao, where it is quite a rare surname, and Australia. Measured by absolute frequency, it is the most numerous in India, Myanmar, and Australia. More prevalently, Séad is the forename as well as the last name.