FeO has not been Ferrous Oxide in many years.
As of the IUPAC Redbook 2005, the preferred name would be "Iron(II) Oxide", however the name "Iron Monoxide" is a valid stoichiometric name for the substance.
The classic name "Ferrous Oxide" is no longer considered acceptable. I quote from Table III's second definition of the suffix "-ous":
Ending formerly added to stems of element names to indicate a lower oxidation state, e.g.
ferrous chloride, cuprous oxide, cerous hydroxide. Such names are no longer acceptable.
The "-ous" suffix is still permitted as part of acid names like "seleninous acid", or "arsorous acid".
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