The court documents, obtained by The Associated Press, were a California petition filed by Laura Mendoza Govan. She identified herself as his ex-girlfriend in the documents.
The petition seeks custody and child support for three children whom Govan says Arenas fathered and has since "financially cut off." She is also seeking support for an unborn child, as well as monthly support for the other children.
In the petition, she is seeking $109,000 in monthly support payments from Arenas and $1.3 million annually.
Govan could not be reached for comment.
A hearing in the case has been set for March 8 in Los Angeles. Orlando plays at Sacramento on March 9.
"Everything I say is reaction for something I did," Arenas said after the Magic's 110-92 victory at Washington Friday. "She got served, so now she wants to say something on TV, that's all it is. I don't pay attention to it. My lawyer said I can take it because ... it's just reactions to reactions."
He said he wasn't surprised by Govan serving him with the petition. He also disputed her claim that he hasn't supported her financially.
"I don't pay much attention to it because this is who she is as a person," he said. "It's sad that it has to be in the public's eye. She gets money. I mean when a girl asks for $100,000 a month and you say no, that doesn't mean you're cut off. You're still getting 20. ... That's the thing that bothers me. She tells the world that she's not getting money. She gets $20,000 a month."
Arenas' attorney, Lisa Fishberg of Washington-based Schertler & Onorato, said in a written statement that, "This is a private matter involving young children. It is inappropriate for Ms. Govan and her attorneys to attempt to turn it into a public spectacle. Gilbert Arenas has been extremely generous in paying monthly support voluntarily. The accusation that they have been 'financially cut off' has no basis in fact."
Govan states in the documents that she and Arenas had about a nine-year relationship that included a September 2008 engagement. The documents also say they lived together in a pair of homes that Arenas owned in Virginia while playing with the Wizards.
Govan is originally from California and the documents say she has returned to the West Coast and that she and the children are living in a low-budget hotel.
She claims in her petition that during the course of the relationship Arenas kicked her out of the homes several times. She says Arenas cut off contact with her and the children in early December, shortly before he was traded to the Magic and moved to Florida.