The Collaborative International Dictionary of English v.0.48:

Morgan \Mor"gan\, n. (Zool.)
   One of a celebrated breed of small compact American saddle
   and trotting horses; -- so called from the name of the stud
   (Justin Morgan) from which the breed originated in Vermont.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Morgan \Morgan\ prop. n.
   John Pierpont Morgan, a noted American financier and
   philanthropist; 1837-1913.

   Syn: J. P. Morgan.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Morgan
    n 1: United States anthropologist who studied the Seneca
         (1818-1881) [syn: Morgan, Lewis Henry Morgan]
    2: United States biologist who formulated the chromosome theory
       of heredity (1866-1945) [syn: Morgan, Thomas Hunt Morgan]
    3: a Welsh buccaneer who raided Spanish colonies in the West
       Indies for the English (1635-1688) [syn: Morgan, Henry
       Morgan, Sir Henry Morgan]
    4: soldier in the American Revolution who defeated the British
       in the battle of Cowpens, South Carolina (1736-1802) [syn:
       Morgan, Daniel Morgan]
    5: United States financier and philanthropist (1837-1913) [syn:
       Morgan, J. P. Morgan, John Pierpont Morgan]
    6: an American breed of small compact saddle horses