ALex Aarons and VINton Freedley, theatrical producers who built the ALVIN and combined their names for its name.
As for others:
The Walter Kerr was originally the Ritz.
The Virginia (named for Jujamcyn's Virginia Binger) was originally the Guild and then the ANTA.
The Lunt-Fontanne was originally the Globe.
The Little Theatre/Helen Hayes was also the Nora Bayes.
The 'American Airlines' was the Selwyn.
The Belasco was originally the Stuyvesant.
The Nederlander was originally the National, the Billy Rose and the Trafalgar.
The Apollo and Lyric Theatres became the reconstituted Ford Center.
The Eugene O'Neill was also the Forrest and the Coronet.
The demolished Helen Hayes Theatre on West 46th Street was also the Folies-Bergere and the Fulton.
The demolished George Abbott Theatre on West 54th Street was also the Craig, Adelphi and 54th Street.
The demolished Harris Theatre on 42nd Street was originally the Candler.
The current Ed Sullivan Theatre was originally the Hammerstein.
And the grand champion of name changes (thanks to IBDB for this one), Studio 54 has variously been known as: Gallo Opera House, New Yorker Theatre, Casino de Paris, Palladium Theatre, Federal Music Theatre, New Yorker Theatre, CBS Radio Playhouse, CBS Studio No. 52 and Studio 54
"Gif me the cobra jool!"