Plutarch Greek Questions, 301d
“Why was the Ithakans’ city named Alalkomenai? The reason is that Antikleia was raped by Sisyphus when she was a virgin and conceived Odysseus. This story is told by many. But Istros the Alexandrian reports in his Commentaries that she had been betrothed to Laertes and gave birth to Odysseus as she was being taken to him near the Alalkomeneion. For this reason, Istros reports that they called the city in Ithaka this, introducing the name as they would from a mother-city.”
πόθεν ἡ τῶν ᾽Ιθακησίων πόλις ᾽Αλαλκομεναὶ προσηγορεύθη; διὰ τὸ τὴν ᾽Αντίκλειαν ὑπὸ Σισύφου βιασθεῖσαν ἐν τῆι παρθενίαι τὸν ᾽Οδυσσέα συλλαβεῖν· ὑπὸ πλειόνων δ᾽ ἐστὶν εἰρημένον. ῎Ιστρος δὲ ὁ ᾽Αλεξανδρεὺς ἐν ῾Υπομνήμασι προσιστόρηκεν, ὅτι τῶι Λαέρτηι δοθεῖσα πρὸς γάμον καὶ ἀναγομένη περὶ τὸ ᾽Αλαλκομένειον ἐν τῆι Βοιωτίαι τὸν ᾽Οδυσσέα τέκοι· καὶ διὰ τοῦτο ἐκεῖνος ὥσπερ μητροπόλεως ἀναφέρων τοὐνομα τὴν ἐν ᾽Ιθάκηι πόλιν οὕτω φησὶ προσαγορεύεσθαι.
For sources Odysseus as the son of Sisyphos, see Aeschylus, fr. 175; Sophocles Ajax 190; Philoktetes 416–17; Euripides Iphigena Aul 524
In the Odyssey we find what seems to be a formulaic combination of three islands near Ithaca. When Odysseus describes where he’s from, he names his home and then adds (9.23-4):
“Many islands are inhabited right near each other
Doulikhion, Samê, and forest-covered Zakunthos.”
πολλαὶ ναιετάουσι μάλα σχεδὸν ἀλλήλῃσι,
Δουλίχιόν τε Σάμη τε καὶ ὑλήεσσα Ζάκυνθος.
And earlier during his discussion with Telemachus, Odysseus hears the suitors similarly described as (16.122-125; cf. 19.130-1):
“However so many of the best men who rule among the islands,
Doulikhion, Samê, and forest-covered Zakunthos.
Alongside all the men who lord over steep Ithaka—
This many men are wooing my mother and ruining my home”
ὅσσοι γὰρ νήσοισιν ἐπικρατέουσιν ἄριστοι,
Δουλιχίῳ τε Σάμῃ τε καὶ ὑλήεντι Ζακύνθῳ,
ἠδ’ ὅσσοι κραναὴν ᾿Ιθάκην κάτα κοιρανέουσι,
τόσσοι μητέρ’ ἐμὴν μνῶνται, τρύχουσι δὲ οἶκον.