The latter appears to be the more correct orthography, as in the name of Virginius or Verginius, but custom has given the preference in modern times to Virgilius.
William Smith. A Dictionary of Greek and Roman biography and mythology. London. John Murray: printed by Spottiswoode and Co., New-Street Square and Parliament Street. In the article on Soranus, we find: "at this present time (1848)" and this date seems to reflect the dates of works cited. 1873 - probably the printing date.