You’ve seen his face, even if you don’t know his name. But with scene-stealing moments in “Harry Potter” (as Bill Weasley, older brother of Ron) and “Star Wars” (as General Hux) and leading roles in “Ex Machina” and “Peter Rabbit,” Domhnall Gleeson is becoming ever-present.

So much so that his American viewers might just have to learn how to pronounce his traditional Irish moniker. (It rhymes with “tonal.”) In his new film, “The Little Stranger,” in theaters Friday, the ginger-haired chameleon plays an uptight, country doctor in the 1940s, driven to the brink of madness by a dark and unknowable force.

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