Bithyni

The Bithyni: A Thracian tribe who, along with the Thyni, migrated to Bithynia in Anatolia - a region which they gave their name to. Herodotus, Xenophon and Strabo all repeat this folk etymology, with its division into 'twin' tribes named Thyni and bi-Thyni, which may simply be a Greek attempt to explain an ancient non-Greek placename that otherwise made no sense in Greek.