Where does “Limburgum” come from?

Limburgum (Latin) comes from Latin -um, from Proto-Italic *-om, from Proto-Indo-European *-oHom.

Ancestry of “Limburgum”, step by step

StepLanguageWordMeaning
1Latin-umnominative neuter singular of -us; accusative...
2Proto-Italic*-om—
3Proto-Indo-European*-oHom—
Every word from Proto-Indo-European *-oHom →Every word from Latin -um →Every word from Proto-Italic *-om →