Alright, jumping right in with what I think you might be getting at — there’s a bit of name confusion that trips a lot of fans up, so I’ll lay it out the way I’d explain it to a buddy over coffee.
I don’t know of a high-profile movie adaptation that explicitly credits a character called “Muscular Hunter Marcus” as a named role. What often happens is people mix up similar-sounding names and archetypes: for example, the brawny, taciturn hunter archetype shows up in films like 'Monster Hunter' (the 2020 movie) where the physical fighter is played by Tony Jaa, but his character wasn’t called Marcus in that film. Another case is someone mixing up 'Marcus' with 'Magnus' — like Magnus Bane from 'The Mortal Instruments:
City of Bones' who was portrayed on-screen by Godfrey Gao; Magnus is very different from a hulking hunter, though the names look similar in casual memory.
If you had a specific book, comic, game, or movie in mind, the quickest way I’d personally verify is to peek at the film’s cast list on 'IMDb' or the movie’s Wikipedia page — the cast credits usually list character names right next to actors so you can spot whether a character called Marcus exists and who played him. I love digging into credits because sometimes the listed name differs from what fans call the character, and that’s often the source of confusion. Anyway, hope that helps point you in the right direction — I get why that muscular hunter image would stick, he’s the sort of character you don’t forget.