Harlequins who have played for the USA national team include Brett 'Rangi' Pedersen, David 'Motor' Care, Brett 'Rosey' Taylor, Bruce 'Monkey' Monroe, Jason Engelbrecht, Taylor Mokate, Justin Boyd, Blake Rodgers,[4] and Bob Olsonoski.

Harlequins who have represented The Western United States Rugby Territory select side include Brett Taylor, Bruce 'Monkey' Monroe, Ed 'Spyk' Gheur, Bob 'Ludo' Lutterbach, Norbert Mueller, Steve Ryan, Duane "Tiny" Watts, Bob Saunders, Phil Waterman, Bob Waterman, Mark Carrion, Johan Van Rensburg, Brian Driscoll, Jess Marshall, Jason Engelbrecht, Taylor Mokate, Justin Boyd, and Blake Rodgers.

[5] Continuing the trend of wider recognition with the arrival of professional rugby Major League Rugby, Maikeli Mudu Naromaitoga (2019) and Jinho Mun (2020) were signed to Austin Gilgronis and Dallas Jackals respectively, having impressed playing for 'Quins D1 squad.

In addition, long-standing Dallas Harlequin Bob Latham has held numerous positions in sports, including vice chairman and former chairman of USA Rugby, former member of board of directors of US Olympic Committee, president of North America Caribbean Rugby Association, director and former president of Dallas All Sports Association, and vice president of Pan American Rugby Association.

The club also has several secondary sponsorships from local and regional businesses such as Texas State Movers, which is owned by former U19 Harlequin Colts coach George Munstedt and Accede Construction, owned and operated by loyal Quins Jess and Andrew Marshall.