Ian
Ian is a Latin form of Ia, meaning “on the Orontes”. It is the ablative singular feminine noun or nominative singular feminine noun or vocative singular feminine noun.
Found 50 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Civili 3.6: … nclamantibus omnibus, imperaret, quod vellet, quodcumque imperavisset, se aequo animo esse facturos, II. Non. Ian. naves solvit. Impositae, ut supra demonstratum est, legiones vii. Postridie terram attigit. Inter Ceraunioru …
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.