Andrew (Andreas). Explained by John as one of the two disciples of the Baptist and identified as the brother of the famous Simon Peter (cf. also Joh 6:8; Joh 12:22). The more formal call of Andrew and Simon, James and John, comes later (Mar 1:16.; Mat 4:18.; Luk 3:1-11).
That heard John speak (tōn akousantōn para Iōanou). “That heard from John,” a classical idiom (para with ablative after akouō) seen also in Joh 6:45; Joh 7:51; Joh 8:26, Joh 8:40; Joh 15:15.