Likely a variant of Brandon, an English name meaning “hill covered with broom” or “broomy hill.”
Brandom is an uncommon variant of Brandon, a name with deep roots in both Old English and Celtic traditions. The most widely accepted etymology traces Brandon to the Old English "brom-dun," meaning "broom-covered hill" — broom being the yellow-flowering shrub (Cytisus scoparius) that once blanketed the hillsides of Britain. The name thus belongs to the ancient tradition of English place-names that became surnames and eventually given names, grounding a person in the particular landscape of a people.
An alternative Celtic etymology connects it to the Irish and Welsh "bran," meaning "raven," a bird of great mythological significance across the British Isles. Saint Brendan the Navigator — the sixth-century Irish monk whose legendary voyage across the Atlantic may have reached North America centuries before Columbus — gave the name its earliest heroic associations, and variations of Brandon, Brendan, and Brandan have been borne by figures across Irish, English, and American history. Brandon became especially popular in the United States during the 1980s and 1990s, reaching peak usage around 1995, appearing in film through characters played by Brandon de Wilde in "Shane" and carried by cultural figures like Brandon Lee.
The Brandom spelling, with its final "m" rather than "n," is a subtle but distinctive variation — it may originate as a clerical or phonetic variant, or as a deliberate parental choice to distinguish a child's name visually. The "m" ending gives the name a slightly softer closure and a visual uniqueness that sets it apart on paper while remaining acoustically near-identical to its parent form. For families who love the sound and history of Brandon but want a spelling that stands out on a page, Brandom offers that distinction without departure.