Bakr, a young he-camel.  That the camel was a sacred animal in certain worships there are many proofs, but there seems to be nothing to connect it specially with Bakr as a tribal name.  The tribe of Bakr-Wail had for its god 'Aud, of whose character we know nothing.  Bakr and Taghlib together worshipped also a god Awal or Owal... (Kinship and Marriage in Early Arabia, Smith, 1903)

Bakr.  Arabic: "cow."  The Indian Moslems sacrifice a cow at the 'Id el Bakr or "feast of the cow," which commemorates Abraham's sacrifice of Ishm'ael (instead of the Hebrew story of the sacrifice of Isaac and the substituted ram).  It is remarkable that this feast is unknown in other Moslem countries; and it naturally gives great offence to Hindus. (Faiths of Man, Forlong, v.1, 1906)