Special forms are used when one wishes to address them, although the language is less elaborate than when speaking to the king or the queen.
A male Luk Luang who does not accede to the throne would assume a new royal surname, normally reflecting his birth name (as opposed to an honorific given later).
The surname can be used by his wife if she is a commoner by birth, possibly with Na Ayudhya added if she has no noble title.
It is otherwise not normally used until his children (or grandchildren) first hold the title of Mom Chao, when the surname will first appear in their names.
and in English as M. R. and translated as "His/Her Excellency") is the title assumed by children of male Mom Chao M.C.
[citation needed] Phra Vorachaya (พระวรชายา) is a title of the royal consort of the Crown Prince.
When referring to her as a wife of the prince, she may be called "Phra Chaya Nai (husband's name)".
For example, if princess Chao Fa, HRH Princess of Thailand, wished to marry a Mom Rajawongse commoner she would lose her royal title (Chao Fa, HRH Princess of Thailand) but retain royal style as follows: However, Chao Fa Chulabhorn Walailak received permission from the king to keep her title when she married commoner Virayudh Tishyasarin.
Nevertheless, it is the princely title which will be more frequently omitted when contracting the title e.g. Somdej Phra Chao Boromawong Ther Kromma Phraya Damrong Rajanubhab (born Phra Ong Chao Disuankumaan).
[3] There are 5 feudal titles for prince/princess: The ranks of royal peerage are: Since the time of King Chulalongkorn, the honorific titles given to the royalties normally incorporate a city name or its modified form, and the holders are known in English as the Prince or Princess of that city.