Look up Tammy in Wiktionary, the free dictionary. Tammy is a feminine given name. It can be a short form of the names Taimur, Tamsin, Thomasina, or Tamar or Tamara. Tamsin and Thomasina are feminine versions of the name Thomas, a Greek form of the Aramaic name Te'oma, meaning twin. Tamara is a Russian form of the Hebrew name Tamar, which means  palm tree .. In Israel Tammy (×ª××) is commonly used as an abbreviation of the original Hebrew name.