The Collaborative International Dictionary of English v.0.48:

Giver \Giv"er\, n.
   One who gives; a donor; a bestower; a grantor; one who
   imparts or distributes.
   [1913 Webster]

         It is the giver, and not the gift, that engrosses the
         heart of the Christian.                  --Kollock.
   [1913 Webster]

WordNet (r) 3.0 (2006):

giver
    n 1: someone who devotes himself completely; "there are no
         greater givers than those who give themselves"
    2: person who makes a gift of property [syn: donor, giver,
       presenter, bestower, conferrer]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "giver":
   Maecenas, Santa Claus, almoner, almsgiver, angel, assignor,
   awarder, backer, bestower, cheerful giver, conferrer, consignor,
   contributor, donator, donor, fairy godmother, feoffor, financer,
   funder, grantor, imparter, lady bountiful, patron, patroness,
   philanthropist, presenter, settler, subscriber, sugar daddy,
   supporter, testate, testator, testatrix, vouchsafer



Bouvier's Law Dictionary, Revised 6th Ed (1856):

GIVER, contracts. He who makes a gift. (q. v.) By his gift, the giver always
impliedly agrees with the donee that he will not revoke the gift.