A Texas gunman who was being sought in connection with the fatal shooting of five people on Friday night after a neighbor asked him to stop firing his weapon remained at large, the authorities said on Sunday.

The gunman, Francisco Oropesa, 38, refused a request by the neighbor to stop shooting because the noise was keeping his baby awake. Instead, the authorities said, Mr. Oropesa retrieved an AR-15 and opened fire at his neighbor’s home in Cleveland, Texas.

Mr. Oropesa, officials said, shot several members of the same family. Among the dead was an 8-year-old boy.

At a news conference on Sunday, the authorities said that more than 200 law enforcement officers were looking for Mr. Oropesa and that they had no leads regarding his whereabouts. They offered an $80,000 reward for his capture.

“We do not know where he is,” said James Smith, a special agent in charge for the F.B.I. in the Houston area. “We do not have any tips right now as to where he may be. Right now, we have zero leads.”

Sheriff Greg Capers of San Jacinto County said that there were 10 people inside the house at the time of the shooting, five of whom remained alive.

He said that Mr. Oropesa had been drinking when the neighbor, Wilson Garcia, approached him to ask him to stop firing his gun. Sheriff Capers said that Mr. Oropesa responded: “I’ll do what I want to in my front yard.”

The F.B.I. identified those killed as Mr. Garcia’s wife, Sonia Guzman, 25; Diana Velazquez Alvarado, 21; Juliza Molina Rivera, 31; Jose Jonathan Casarez, 18; and Daniel Enrique Laso, 8.

Three other people were taken to hospitals after the shooting. The victims were all from Honduras, officials said.

The authorities had initially identified the man as Francisco Oropeza, but on Sunday afternoon, the F.B.I. said that his last name would be spelled with an “s” going forward “to better reflect his identity in law enforcement systems.”

Court records show that Mr. Oropesa had been charged with misdemeanor drunken driving in Texas in 2009 and convicted. The sentence in that case was not immediately available.

Eliza Fawcett and April Rubin contributed reporting and Kirsten Noyes and Jack Begg contributed research.