Irish Names that Start With O

  1. O'donovan
    • Origin:

      Irish, 'son of the dark one"
    • Description:

      Donovan is on the rise, so why not this sequel?
  2. O'brien
    • Origin:

      Irish
    • Meaning:

      "descendant of Brian"
    • Description:

      This kind of authentic Irish surname makes a memorable first name for either sex, following in the path of all the Mac and Mc names recently popular.
  3. Obrien
    • Origin:

      Irish surname
    • Meaning:

      "descendant of Brian"
    • Description:

      The use of O-prefixes could create the next wave of Irish inflected names, offering an innovative way of honoring a relative with a behind the times moniker.
  4. O'fallon
    • Origin:

      Irish
    • Meaning:

      "son of the leader"
    • Description:

      Fallon has gone feminine, but this puts it back in the boys' camp.
  5. O'callahan
    • Origin:

      Irish
    • Meaning:

      "son of the church lover"
    • Description:

      One of the most usable of the fashionable O'Names.
  6. O'keeffe
    • Origin:

      Irish surname
    • Description:

      If you love the venerable Southwestern painter but feel Georgia's gotten too overheated, you might want to go all the way to this Irish surname in the fashionable O' family.