Team owner Jeffrey Loria formally introduced the name change, which led in to the unveiling of the team's new logo and uniforms.
"The dream of our fans has finally come true, with the approaching of the opening of our sparkling new stadium," Loria told the crowd. "The Marlins Ballpark, the coolest ballpark ever."
Before the change became official, video snapshots were shown on the giant scoreboard of the franchise's first 19 seasons.
Swapping out the Florida Marlins for the Miami Marlins was part of the agreement with local officials when funding for the new ballpark was approved a few years ago.
The team's new colors are black, yellow, orange and blue.
"It's about Miami," Loria said. "It's the coolest place ever. Miami has a certain flavor."
Friday capped a busy week in which the Marlins entertained high-profile free agents Mark Buehrle, Jose Reyes and Albert Pujols, who was in town on Friday and left in the evening.
As a lead up to the name change, the Marlins hosted a Fish and Chips fundraiser for the Marlins Community Foundation on Thursday night at the ballpark. Technically, it was the first team function at the baseball-only ballpark. Hanley Ramirez, Josh Johnson, Ricky Nolasco, Anibal Sanchez, Gaby Sanchez, Logan Morrison, Emilio Bonifacio, John Buck and Omar Infante were among the players in attendance.
The fundraiser was in a large tent outside New Marlins Ballpark, which remains on schedule and on budget to open in March 2012.
"This is the first event at the new ballpark, and it's exciting," team president David Samson said Thursday night. "Seeing people parked in the garages is unbelievably exciting. Seeing people come here, experiencing the ballpark -- this is what we've been looking forward to for a lot of years."
The rebranding of the franchise comes after 19 seasons of the team playing at spacious Sun Life Stadium, located in no-frills Miami Gardens, near the Broward County and Miami-Dade County lines.
The Florida Marlins have always shared their home with the Miami Dolphins, who control Sun Life Stadium. The Marlins compiled a 1,435-1,575 all-time record, and they won World Series championships in 1997 and 2003.
Moving to the Little Havana section of Miami brings the franchise closer to the glitz of South Beach and the inner-city feel of downtown Miami.
"I think they'll do well," said former Marlins manager Jack McKeon, who once again is a special adviser to Loria. "I think the club will draw much better. I think the revenues will be increased. I think they will be in position to spend some money to retain their players and get some free agents. I think it's going to be a successful operation."
New Marlins Ballpark alone promises to be a selling point. The Marlins are looking to dramatically upgrade their roster, and the current players are welcoming anyone wanting to be part of the club's new beginning.
"Anybody that wants to come, and if you're good, come on over," Morrison said. "I want to win."
From the fans' perspective, the ballpark offers a complete upgrade over Sun Life Stadium. For the first time, Marlins fans don't have to worry about rain delays or enduring the excessive South Florida summer heat.
The seats are wider, and they're all angled toward home plate.
The new building already is being used in the recruitment of players.
On Tuesday, left-hander Buehrle got a stadium tour. The same routine was done on Wednesday for shortstop Reyes, who is also testing the market. On Thursday, team officials flew to the Dominican Republic to attend the workout of center fielder Yoenis Cespedes, a Cuban defector who is expected to be declared a free agent later this month.
The rebranding of the Marlins, and their new ballpark, promise to be an attraction to players and fans.
First baseman Gaby Sanchez, who grew up in Miami, says the building alone will attract top talent to the Marlins.
"I don't think you really have to talk up anything," Sanchez said. "I think this stadium says it all by itself."
With their new logo and uniforms, the team will sport a fresh look.
After Friday's announcement, new Marlins merchandise went on sale at 11 p.m. ET at the ballpark. It will remain on sale at the stadium through Sunday.
On Saturday, Marlins gear will be on sale at select South Florida outlets -- Sawgrass Mills (12801 Sunrise Blvd.), Dolphin Mall (11401 NW 12th St. in Miami), Aventura Mall (19501 Biscayne Blvd.) and the Marlins en Miami Store (3701 SW 8th St.).
Marlins players will be on hand at several locations. Johnson and Nolasco are expected at Sawgrass from noon-1 p.m. From 12:45 p.m.-1:45 p.m., Infante, Gaby Sanchez and Ramirez are scheduled to be at Dolphin Mall, and Buck and Anibal Sanchez are slated to visit the Marlins en Miami Store from 11:30 a.m.-12:30 p.m.
"Judging by sales and judging by the general excitement around our team, I'd say people are feeling pretty good," Samson said.