Gareth

There have been many people associated with Doctor Who named Gareth.

First name only

 * Gareth - (DW: Doctor Who)

As first name

 * Gareth Evans - (DW: Army of Ghosts)

Cast and Crew Named Gareth

 * Gareth Armstrong - actor
 * Gareth David-Lloyd - actor playing Ianto Jones in Torchwood.
 * Gareth Gwenlan - Assistant Floor Manager and Production Assistant
 * Gareth Hale - actor
 * Gareth Harris - K9 actor.
 * Gareth Huges - Torchwood camera operator.
 * Gareth Hunt - actor
 * Gareth Jeanne - a Props chargehand.
 * Gareth Jenkins - Voice actor also working with post production and sound design.
 * Gareth Roberts - writer
 * Gareth Thomas - Voice actor and actor.
 * Gareth Wigmore - Short Trips writer.

Other
Gareth Jenkins (A Fix with Sontarans) - The child from A Fix with Sontarans, which is generally considerd non-canon.