The morning planet was called Apollo, and the one at evening Hermes/Mercury before they realised they were the same, thereupon the name 'Mercury/Hermes' was kept, and 'Apollo' was dropped.
ðə mˈɔːɹnɪŋ plˈænɪt wʌz kˈɔːld ɐpˈɑːloʊ, ænd ðə wˈʌn æɾ ˈiːvnɪŋ hˈɜːmiːz slˈæʃ mˈɜːkjʊɹi bᵻfˌoːɹ ðeɪ ɹˈiːəlaɪzd ðeɪ wɜː ðə sˈeɪm, ðɛɹˈʌpɑːn ðə nˈeɪm mˈɜːkjʊɹi slˈæʃ hˈɜːmiːz wʌz kˈɛpt, ænd ɐpˈɑːloʊ wʌz dɹˈɑːpt.