Rabbi Yaakov ben Avraham Shlomo Sinna (יעקב בן אברהם שלמה שיננא, before 1615) of Prague, was the author or compiler of the earliest edition of the Ma'ana Loshen, a popular anthology of teḥinot for those visiting the graves of loved ones. Unfortunately, we know very little else concerning Rabbi Yaakov, this one detail having been brought by the Bibliography of the Hebrew Book. If you have any further details, please let us know.