From Tolkien Gateway
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The exact meaning of Arcastar is unknown. Ryszard Derdziński has suggested that arcastar could possibly mean "translator" (or "one who carries across"), based on his research about the Tolkien family name.
- Lambengolmor discusion "Tolkien in Oxford": 9.32 (Anders Stenström), 9.33 (Carl F. Hostetter), 9.34 (Roman Rausch), 9.49 (Jerome Colburn).