Intelsat Americas, was the re-designation given to the several Telstar

Telstar

Telstar is the name of various communications satellites, including the first such satellite to relay television signals.The first two Telstar satellites were experimental and nearly identical. Telstar 1 was launched on top of a Thor-Delta rocket on July 10, 1962...

 satellites serving North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

 following their sale to Intelsat

Intelsat

Intelsat, Ltd. is a communications satellite services provider.Originally formed as International Telecommunications Satellite Organization , it was—from 1964 to 2001—an intergovernmental consortium owning and managing a constellation of communications satellites providing international broadcast...

 by Loral Space & Communications

Loral Space & Communications

Loral Space & Communications Inc. is a satellite communications company headed by Michael B. Targoff and incorporated in Delaware. The company was formed in 1996 from the remnants of Loral Corporation when Loral divested its defense electronics and system integration businesses to Lockheed Martin...

 in 2003. On February 1, 2007, they were renamed under the "Galaxy" brand.

The following name conversions were applied to the Telstar satellites serving the United States: http://www.intelsat.com/_files/network/satellites/intelsat-satellite-name-conversion-table.pdf

• Telstar 5 → Intelsat Americas 5 → Galaxy 25
  Galaxy 25
  Galaxy 25 launched in 1997, formerly known as Intelsat Americas 5 until February 15, 2007 when it was renamed as result of the merger between owner Intelsat and PanAmSat or Telstar 5) is a medium-powered communications satellite formerly in a geostationary orbit at , above a point in the Pacific...
  
  
• Telstar 6 → Intelsat Americas 6 → Galaxy 26
  Galaxy 26
  Galaxy 26 is a communications satellite owned by Intelsat. It was built by Space Systems/Loral, as part of its FS-1300 line. Galaxy 26 was formerly known as Intelsat Americas 6 and Telstar 6. It was launched aboard a Proton-K/DM3 from Baykonur LC81.It spent most of its operational life at the...
  
  
• Telstar 7 → Intelsat Americas 7 → Galaxy 27
  Galaxy 27
  Galaxy 27 is a communications satellite owned by Intelsat located at 129° W longitude, serving most of the North American market. It was built by Space Systems/Loral, as part of its FS-1300 line...
  
  
• Telstar 8 → Intelsat Americas 8 → Galaxy 28
  Galaxy 28
  Galaxy 28 is a communications satellite owned by Intelsat located at 89° W longitude, serving the North American market. It was built by Space Systems/Loral, as part of its FS-1300 line. Galaxy 28 was formerly known as Intelsat Americas 8 and Telstar 8...
  
  
• Telstar 13 → Intelsat Americas 13 → Galaxy 23
  Galaxy 23
  Galaxy 23 is the name given to the C-band service of the Galaxy 23/EchoStar 9 communications satellite jointly owned by Intelsat and EchoStar located at 121° W longitude, serving the North American market. It was built by Space Systems/Loral, as part of its FS-1300 line. Galaxy 23 was...
  
  
• Intelsat Americas 9, while under construction → was finished and launched as Galaxy 19
  Galaxy 19
  Galaxy 19 is a communications satellite owned by Intelsat located at 97° West longitude, serving the North American market. Galaxy 19 replaced Galaxy 25 which is nearing the end of its design life and has been moved to 93.1°W longitude. It was built by Space Systems/Loral, as part of its FS-1300...
  
  

The Telstar satellites that do not directly serve the United States retained their original Telstar designation.