Most Thais will have two names, their formal name consisting of a first and family name (and possibly a title) and a nickname ('cher len'). Formal names are preceded with the honorific 'Khun' for both males and females. Thais generally use 'Khun' and the first name to refer to themselves. For example, Anchuree Noradee will introduce herself as Khun Anchuree. The 'Khun' should be used at all times for politeness. Those individuals with titles will be used to being addressed with the title included, for example, Dr Chusak Prasert will be referred to as Dr Chusak, Khun Dr Chusak, or even just Khun Dr. Those of high rank, including monks, are referred to by their subordinates as 'Than', but this is extremely formal and unless addressing a monk or a member of royalty, foreign nationals should stick with 'Khun'.
Nicknames are used in informal situations. At work, females will often use their nicknames but men generally prefer to use their formal name. Nicknames are usually chosen when the individual is a small child and reflect the physical characteristics or endearing qualities of the child at that time. Nicknames referring to the natural world, especially animals, flowers, and colours, are also common. Nicknames are generally used without the honorific 'Khun' amongst good friends. Examples of nicknames include Fon (rain), Nok (bird), Lek (small), Yai (big or tall), and Daeng (Red).
Foreign nationals are usually referred to by the Thai honorific 'Khun' followed by their first name e.g. Khun David. Males are often referred to by using 'Mr' and their first name e.g. Mr David. Teachers may be referred to by the word 'ajarn', meaning teacher, and their first name, e.g. Ajarn Mary.
