Irish (Cork and Kerry): shortened, anglicized form of O'Sullivan, Gaelic Ó Súilleabháin 'descendant of Súileabhán'. The base word is súil 'eye'; Woulfe reads it as súil + dubh 'dark' + diminutive -án. The family is associated with southwestern Ireland (Tipperary, Kerry). About 78% of Sullivans live in the United States.
Spellings and related forms: O'Sullivan, Ó Súilleabháin, Sullavan, Sullivant, Sillivant.
The root of Súileabhán is súil, "eye", often read as "dark-eyed" or "hawk-eyed". The owl stands for the watchful eye.
Most surnames have no single "family crest". In heraldry, a coat of arms belonged to one person and passed down one line of descent. Sites that sell "the Sullivan coat of arms" usually show the arms of one historic family that shared the name. Ours is different on purpose: an original design built from what the name means, which any Sullivan can own honestly.
Blankets: soft velveteen plush (100% polyester), printed on one side; may run up to 3 in. short of the listed size. Rugs: polyester chenille with hemmed edges and a coated backing, for indoor use. Both are printed in the USA (Georgia and North Carolina).
Name meanings come from the sources above, checked 2026-10. Where scholars disagree, we say so.