Beware: This article contains potential spoilers for Star Wars: Episode VII - The Force Awakens.
Although many fans feel a very close affinity with the Star Wars universe, we often adopt a very formal and reverential approach to the characters. For one thing, we almost refer to them by their full names (at least those which have them): Luke Skywalker, Han Solo, Obi Wan Kenobi, Lando Calrissian, Boba Fett, even Jar Jar Binks. Their full names comfortably roll of our tongues like a oft-recited mantra.
Interestingly, many of the characters announced in Star Wars: Episode VII - The Force Awakens do not have surnames, and J.J. Abrams claims there's a very important reasons for this: Spoiler-prevention.
See the introduction of the new, mysterious, characters in the first Star Wars: Episode VII trailer below:
Abrams recently revealed to Entertainment Weekly that Kylo Ren is, in fact, not the actual name of The Force Awakens controversial-lightsaber wielding baddie, therefore suggesting his real name might reveal some interesting lineage. The same it seems is also true for the other first-name only Star Wars characters, including Daisy Ridley's Rey and John Boyega's Finn. When asked about the character's surnames, Abrams claimed the decision not to release them was completely deliberate, stating:
I will only say about that that it is completely intentional that their last names aren’t public record.
So it seems like Abrams is trying to keep us spoiler free by refusing to reveal the family ties of the traditional and newly introduced Star Wars characters. However, in a way, simply stating the fact the names are hidden to avoid spoilers is kind of a spoiler in its own right. It basically confirms that some characters, namely Rey, Finn and Kylo Ren, will have some kind of family connection to one of the established Star Wars families - whether its Solo, Skywalker or Kenobi. Unless it's a clever double bluff.
The Star Wars Family Theories
Of course, fan theorists have been suggesting this from the earliest days of Star Wars: Episode VII - The Force Awakens preproduction. One of the most persistent theories claims that Rey could be the daughter of Han Solo and Princess Leia. The evidence for this is mostly circumstantial and revolves around the fact she appears to live on the desert planet Jakku, which the Millennium Falcon is also seen flying around. This suggests the Solos may have some kind of connection to the planet and may have raised a family there. Alternatively, the presence of their daughter on the planet might also explain what brings Han and Leia to Jakku. Appearance wise, Ridley could also conceivably be the daughter of Harrison Ford and Carrie Fisher's characters.
The name 'Rey Solo' is currently ranking very high on Google, suggesting many people are searching for it. So even if it's not true, it seems to be a popular theory.
The theories surrounding Kylo Ren are slightly more expanded and are based on rumors have have emerged from the production. With this in mind, beware of major incoming spoilers.
According to rumors attained by ScreenRant, Kylo Ren could also be the child of Han and Leia. The main evidence for this is a scene which reportedly takes place about halfway through the film. In the sequence, the Millennium Falcon is shot down on a snowy planet by Kylo Ren. Upon boarding the Falcon, Ren heads to the cockpit to sit alone and have a contemplative moment to himself. This suggests Ren has some kind of emotional attachment to the Falcon, perhaps because he knows it is his father's ship.
But where are the Skywalkers? Well, the voiceover, confirmed to be provided by Mark Hamill as Luke Skywalker, in the second Star Wars: Episode VII teaser trailer could suggest he's also got kids. Luke, rehashing a line previously said in Return of the Jedi, explains:
The Force is strong in my family. My father has it. I have it. My sister has it... You have that power too.
This seems to suggest Luke is also talking to someone attached to his family. Could one of the newly introduced characters therefore be a Skywalker?
Others are also suggesting Finn could be the son of Lando Calrissian. Although, to be honest, this is almost entirely because Lando and Finn are basically the only two black characters in the entire Star Wars universe.
However, statements from sources attached to the project have suggested that Abrams will not even reveal the lineage of the newly introduced characters in the film. According to ScreenRant, multiple sources attached to Star Wars: Episode VII have stated that none of the characters are Solos or Skywalkers and that revealing their family history is not Abrams' main concern. One source stated:
It would not knock me on my knees to learn she [Rey] is a Solo. VII does not answer that question. It just presents it.
Abrams is, however, well-known as one of the Hollywood's most extensive purveyors of disinformation. He is not averse to outright lies if it means protecting the sanctity of his script. For example, prior to the release of Star Trek Into Darkness, he continually reiterated that Benedict Cumberbatch was not Khan. It later turned out he was. I wouldn't even put it past Abrams to lie to his production staff if it meant keeping his story secrets intact. With this in mind, there might only be a very small band of trusted confidants who know the actual family background to the new Star Wars characters.