You might want to consider changing the usage to 'Medieval Latin' (c. 6th-14th century AD), as that is more in accordance with the description than 'Late Roman' (i.e. Late Latin → 3rd-6th century AD).In addition to this, I am unable to find evidence that Ieronimus was used in Late Roman times. Both Hieronimus and Hieronymus were (as is indicated by surviving inscriptions), but not Ieronimus: that one appears at least as early as the 13th century (at least in the Netherlands, i.e. mainland Europe). So again, 'Medieval Latin' seems to be more suitable in this case.
In addition to this, I am unable to find evidence that Ieronimus was used in Late Roman times. Both Hieronimus and Hieronymus were (as is indicated by surviving inscriptions), but not Ieronimus: that one appears at least as early as the 13th century (at least in the Netherlands, i.e. mainland Europe). So again, 'Medieval Latin' seems to be more suitable in this case.