No. Just because they are both dark-skinned doesn't mean they're related. Mace was a loyal Jedi, and thus had no kids.
Before being signed on as Mace Windu for Star Wars: Episode I The Phantom Menace, Samuel L. Jackson was slated to appear in a cameo role as Grando Calrissian, Lando's father.
Finn is not only Lando Calrissian's son but Mace Windu's grandson. Mace Windu could have had a child several years before the Clone Wars, then hiding him (Lando) on Cloud City to keep Lando safe as Mace knew that the Sith were nearby and building strength.
Ghôsh Windu was the Korunnai tribe/family to which Mace Windu belonged. It was once loosely affiliated with Ghôsh Rostu. Windu and his "brother" Kar Vastor were the only known remaining members of the ghôsh by 22 BBY.
Landonis Balthazar "Lando" Calrissian III is a fictional character in the Star Wars franchise. He was introduced in The Empire Strikes Back (1980) as an old friend of Han Solo and the administrator of the floating Cloud City on the gas planet Bespin.
It is clear at force-sensitivity is passed from parent to child and that Mace would not have had any children due to the rules of the Jedi order. There is absolutely no reason however to assume that he didn't have other relations, even siblings, who were force sensitive but had foregone Jedi training.
Mission to Mathas. Padawan Windu was trained in the ways of the Force by Jedi Master Cyslin Myr. Following his early trials as a youngling, Windu attained the status of Padawan by becoming Jedi Master Cyslin Myr's apprentice.
Mother Talzin to Mace Windu. Mother Talzin is a neutral character who sometimes acts as an antagonist in the 2008-2020 animated TV series Star Wars The Clone Wars. She is the manipulative leader of the Dathomirian Nightsisters and the Frangawl Cult and the mother of Darth Maul and Savage Opress.
Billaba became Windu's Padawan and trained under the Jedi Master in the ways of the Force. During her training, Windu allowed her to study Form VII variant known as Vaapad. She eventually became a Jedi Knight, renowned for her skills with a lightsaber and favored Form III when teaching other Jedi.
Lando Calrissian, Junior was a Human male, the son of Lando Calrissian, Senior and Tendra Risant Calrissian. Calrissian Senior first learned of his wife's pregnancy while on the planet Kashyyyk late in the year 40 ABY.
Finn: He is the son of Lando Calrissian | Fandom.
Lando's daughter was named Kadara.
And it's: Baron Landonis Balthazar Calrissian III. This is indeed something of a scoop – even the Wookieepedia, home of everything exhaustingly Star Wars, which lists him as merely Lando Calrissian.
Trained as a Jedi Guardian, Windu was considered to be one of the best swordsmen in the history of the Jedi Order and had created the modern seventh form of lightsaber combat, Vaapad along with fellow Jedi Sora Bulq. He was the only practitioner of the form who did not fall to the dark side.
A grim Jedi Master with an amethyst-bladed lightsaber, Mace Windu was the champion of the Jedi Order, with little tolerance for the failings of the Senate, the arguments of politicians, or the opinions of rebellious Jedi.
Mace Windu appears as a Force ghost in the alternate history comic Star Wars Infinities: The Empire Strikes Back in a vision to Darth Vader, though this may only be a mental vision in Vader's mind as opposed to an actual Force ghost.
The Emperor's son sired a child of his own, Rey, his daughter who inherited Sidious' power in the Force, unlike himself.
Mace Windu is not a 'Gray Jedi. ' Not in canon nor in Legends did Mace ever veer away from the Jedi Order or Jedi Code. In fact, this over-reliance and dedication to the Code played a huge part in his and the Jedi Order's downfall.
In 19 BBY, the lightsaber was lost when it was dropped out of the window of Supreme Chancellor Palpatine's office prior to his death. In 18 BBY, Duros salvagers recovered it and gave it to Senator Sano Sauro.
At some point, Yoda took on a human named Kantam Sy as his Padawan. The two were stationed at the Jedi Temple on the planet Endovar.