Hieronymus

The usage of "Dutch (Archaic)" should be changed to "Dutch (Rare)", as Hieronymus is far from obsolete in the Dutch-speaking world. There are still hundreds of Dutch and Flemish men who have the name as an official name on their birth certificate; it's just that the majority of them go by a different, more informal name in daily life (such as Harry, Jeroen and Ron). In that regard, Hieronymus is similar to names like Adrianus and Franciscus, which are also primarily used on birth certificates rather than in daily life (and you made sure to mention that in their entries).

---

Sources:
• https://nvb.meertens.knaw.nl/naam/is/Hieronymus (in Dutch; shows the prevalence of the name in the Netherlands in 2017)
• http://www.names.be/voornamen.html?met=Hieronymus&sort=beldesc (in Dutch; shows the prevalence of the name in Belgium in 2009)
• (general): https://www.linkedin.com/pub/dir/?first=Hieronymus&last=&search=Zoeken
• https://www.facebook.com/search/people?q=hieronymus
• obituary of Hieronymus "Harrie" de Vries (1952-2014): https://www.mensenlinq.nl/overlijdensberichten/hieronymus-petrus-%28harrie%29-de-vries-119954 (in Dutch)
• obituary of Hieronymus "Harry" Wijnbergen (1935-2019): https://mensenlinq.nl/overlijdensberichten/hieronymus-maria-(harry)-wijnbergen-674445 (in Dutch)
• obituary of Hieronymus "Jeroen" Zwagemakers (c. 1953-2010): https://mensenlinq.nl/overlijdensberichten/ir.-alphonsus-hieronymus-antonius-(jeroen)-zwagemakers-20198 (in Dutch)
• obituary of Hieronymus "Ron" Teuben (1929-2013): https://mensenlinq.nl/overlijdensberichten/hieronymus-johannes-cornelis-(ron)-teuben-55438 (in Dutch)

This name is not really used anymore in the Netherlands. The modern form, Jeroen is more common.

There is a female form of this name: Hieronyma.