For the Geonim sages see Achai Gaon. For the sages Amora see Rabbi Aha (English), Aha b. Jacob (English) or Aha b. Raba (English).
R. Ahai (Hebrew: רב אחאי, pronunciation: Rav Achai, sometimes recorded as R. Aha, Hebrew: רב אחא, pronunciation: Rav Acha) was a wise Savora Jew from the first generation of the Savora era. R. Ahai is the sage Savora most mentioned in the Babylonian Talmud. His philosophy about the questions in the Talmud has been extracted as the prologue: "R. Ahai replied: ..." The sages of the Land of Israel said of him:
"Pay attention to the opinion of R. Ahai because it enlightens the eyes of exile" -B. Talmud, Chullin Treaty, bis 59
As for your exact identification and period, there are a number of premises. Eras rabínicas
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