Only the words that are made up of them do. The individual letters in a word don't mean anything. By themselves, they simply indicate what sound you're supposed to make. For example, the letter s indicates the s sound (which sounds like ssssss).
About Rupert Boneham. Rupert Boneham (born January 27, 1964) is an American mentor for troubled teens, who became known to reality television audiences in 2003 as a contestant on Survivor: Pearl Islands where he placed 8th. He later appeared on the All Stars, Heroes vs. Villains, and Blood vs. Water seasons of Survivor, placing 4th, 6th, and 20th respectively.
Daniel Dan Fitzgerald is a fictional character from the Australian Network Ten soap opera Neighbours, played by Brett Tucker. He made his first on-screen appearance on 1 September 1999. Dan becomes a teacher at Erinsborough High and shares a house with fellow teacher, Tess Bell. He remained as a recurring character until 2000. Tucker returned on 30 October 2007 and became part of the regular cast.