Name Qōsṭrōs Gender Masculine Usage Assyrian Scripts ܩܘܣܛܪܘܣ(Syriac) Edit Status Status Meaning & History Classical Syriac alternative form of Castor, via the Greek form Κάστωρ (Kastor). It is also an alternative vocabulary word for "beaver", the more usual word being ܩܣܛܘܪ or ܩܐܣܛܘܪ (both transliterated as qasṭor; cf. Qasṭor).