Police have confirmed that a Quincy real estate broker accused of fleeing with nearly $2 million in investors’ money is the same person who allegedly defrauded investors of tens of millions of dollars, from New York to Florida.

A warrant was issued Wednesday for the arrest of Scott Wolas, known in Quincy as Eugene Grathwohl, on charges of larceny, embezzlement, and identity theft, Detective Lieutenant Kevin Tobin of the Quincy Police Department said. Wolas, a disbarred lawyer and former stockbroker, also has outstanding warrants in New York, Florida, and Alabama, according to Tobin.

“We know for sure that Eugene is Scott Wolas,’’ he said. The number of alleged victims in Quincy has risen to 20, claiming $1.9 million in losses, Tobin said, noting, “I have a feeling it’s going to get a lot worse.’’

The police are cooperating on the case with the FBI, he said, to find a man who has eluded authorities for two decades and has used at least six different names.

The Globe reported Tuesday that the man known to clients here as Grathwohl had failed to show up for a long-awaited closing of his deal to purchase the former Beachcomber bar on Wollaston Beach in Quincy. No one, including his girlfriend with whom he lived, has seen him in nearly two weeks.

Wolas, 67, was known to forge close relationships with his clients, many of whom considered him a friend. He worked out of a Century 21 office in Quincy, where he had been a top broker since getting his license in 2009.

He liked to wine and dine clients at the Neighborhood Club of Quincy, a members-only dinner and social club, according to several people who know him.

One by one, he persuaded clients to invest sums ranging from $25,000 to $250,000 in local properties he said he was developing, according to three alleged victims. The most recent ones at issue are the Beachcomber and an adjacent property at 833 Quincy Shore Drive.

The owner of the adjacent property is Marshall Hall and his Newbury Realty Co. A former Boston real estate executive, he now lives in Boca Raton, Fla. In an interview Wednesday, he said he had hired Wolas — whom he knew as Grathwohl — as construction manager on a house at 833 Quincy Shore Drive after successfully working him on two condominiums.

“You could not help but be impressed by this guy, especially when it came to real estate,’’ Hall said. When Hall traveled to Quincy to meet with him, Wolas was so well versed in the law, Hall more than once asked if he was a lawyer. Wolas said he wasn’t, Hall said.

Hall, who said his grandfather once owned both 833 and the Beachcomber property, found his way to the man known as Grathwohl in an unusual way. He said he was referred by a friend of his in Boca Raton named Eugene Grathwohl, and whose deceased father had the same name.

The Quincy man who left the name Scott Wolas behind in Manhattan in the 1990s appears to have taken the identity of the late Grathwohl, Hall said.

Police say Wolas has used at least five aliases over the years, including Allen L. Hengst, Drew Prescott, Frank Amolsch, and Robert F. McDowell. His girlfriend, Lorraine Croft, who also said she was duped by Wolas, said he went by Drew Prescott when she met him in 2001.

According to national press reports and public records, Wolas was indicted on 119 counts of larceny and fraud in New York in 2001, for allegedly stealing $20 million from law clients. By then, he was long gone.

Disbarred in New York in 1999, Wolas by then was working as a financial adviser in Florida, under the name, Allen Hengst.

When he left Florida for Massachusetts, Wolas owed millions to investment clients with an American Express Co. subsidiary where he had worked in Orlando.

The Massachusetts Securities Division on Tuesday issued a subpoena to bring Wolas in for questioning.

Beth Healy can be reached at beth.healy@globe.com. Follow her on Twitter @HealyBeth.