Rebecca by Daphne De Maurier also has a sequel in 2001. It is approved by the original author’s estate as well.
OK bear with me for a moment
The 1992 Jean Claude van Damme film Universal Soldier has numerous follow-up sequels; however there three different timelines they follow:
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Universal Soldier (1992) —Made for TV movie Universal Soldier II: Brothers in Arms (1998) and Made for TV movie Universal Soldier III: Unfinished Business (1998)
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Universal Soldier (1992) and theatrical fim Universal Soldier: The Return (1999)
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Universal Soldier (1992) and direct to video film Universal Soldier: Regeneration (2010) and direct to video film Universal Soldier: Day of Reckoning (2012)
And for the record The Terminator franchise as at least four different timelines:
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The Terminator —- Terminator 2 —- Terminator 3 —- Terminator Salvation
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The Terminator —- Terminator Genisys
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The Terminator —- Terminator 2 —- Terminator: Dark Fate
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The Terminator —- Terminator 2— Terminator: The Sarah Connor Chronicles
Although it’s well-known to serious fans of Star Trek, casual fans may not realize that the first official sequel to the original TV series was not 1979’s Star Trek: The Motion Picture, but rather Star Trek: The Animated Series, which was developed by Filmation, in collaboration with Gene Roddenberry, and which originally ran on NBC from 1973-74. Trek writers Dorothy Fontana and David Gerrold have indicated that they consider the animated series to depict “year 4” of the Enterprise’s five-year mission.
However, the animated series was effectively “de-canonized” by Roddenberry’s office in the late 1980s. That said, in the years since, a number of events and characters mentioned in the animated series have wound up in other Trek shows and books, and information from the series is now incorporated in Paramount’s official Star Trek reference site, so maybe it is canon once again. 
I’d bet that most fans of A Christmas Story haven’t seen (or perhaps heard of) Ralphie’s “summer vacation” movie, Ollie Hopnoodle’s Haven of Bliss!
Howard and Williams were in the sequel.
What, in archive footage?
Grease 2 was awful. Even Michelle Pfeiffer couldn’t save it.
There were a couple of good songs.
The Exorcist III isn’t all that bad as far as horror movies with psychological thriller elements go. I’ve even read a few retrospective reviews claiming that it’s one of the very best horror movies of all time, though I wouldn’t go that far myself. It certainly had some excellent source material (Blatty’s novel Legion which, like his original Exorcist novel, is not overtly supernatural but rather presents the reader with plausible naturalistic explanations for everything).
The Star Wars Holiday Special has to rank among the worst official sequels of all time. Surprised no one has mentioned it so far.
There’s a 2008 direct-to-video sequel to 1983’s WarsGames WarGames: The Dead Code - Wikipedia
The 1998 film Soldier starring Kurt Russell is set in the same universe as the 1982 film Blade Runner --it is not a sequel though it is more of a spin-off. I don’t think most people know both films have that relation.
As I understand it, Soldier’s screen writer, David Peoples, who was also the co-writer of Blade Runner, has said that he intended it to be in the same universe, but there’s no actual official connection.
Return of the Vampire is a Columbia film from 1943 that seems pretty clearly intended to be perceived as a sequel to Universal’s 1931 film Dracula. Both films star Bela Lugosi as the vampire, although, since they didn’t have the rights to the “Dracula” name he’s named Armand Tesla.
Killed in London by having a stake driven into his heart, Dracula comes back from the Undead. The film uses a couple of tropes that would be used by Universal itself when it brought back Dracula the next year in House of Frankenstein – Dracula being revived by having the stake pulled out of his heart, and his being destroyed by sunlight. (Universal had already re-introduced the sunlight trope in Son of Dracula). It’s also the first film, AFAIK, the uses the trope of the vampire having a werewolf as an assistant.
The pointlessly awful movie Troll, perhaps qualifying with the minimum value of ‘popular’, was followed by Troll 2, and even worse movie. Troll was a star-studded affair, based on the minimum value of ‘star’, while Troll 2 was cast with people who showed up to be extras. The movie had nothing to do with the original movie, and did not even have any trolls in it. Troll 2 may have passes it’s precursor in popularity in the category of movies so bad they are good, while many people say it is simply bad.
Lee Falk did the comic strip The Phantom published by King Features Syndicate.
In 1943, Columbia Pictures filmed it as a matinee serial.
In 1955, Columbia started filming a sequel. However, they discovered that the film rights had expired. After some hasty negotiations, it became apparent that King Features wanted more money than Columbia was willing to pay. So they did a quick re-write, and a hasty costume change, and it became The Adventures of Captain Africa.
There were two unofficial sequels to Heidi - the copies my sister had were credited to “Spyri’s translator”.
That ain’t all! There are two more sequels: My Summer Story with Mary Steenburgen, and, of course, A Christmas Story 2 with Daniel Stern. Saints preserve us!
Oh My God these are BAD movies.