Balakrishnan. Some West and East Indian groups, such as the Gujaratis, Marathis and Bengalis, use family surnames, although the Gujaratis may choose whether to merge their father's name with the surname. Sikh men invariably adopt 'Singh' as their surname, while Sikh women adopt 'Kaur', as is their traditional practice. However, some Sikhs have also re-introduced supplementary family or clan names, thus instead of simply 'Charanjit Singh', an individual might adopt the name 'Charanjit Singh Siddhu' for himself or his son. Contribution Indian institutions Many of the clubs and associations established by and for Indians in Singapore are defined along narrower linguistic, religious or other sub-ethnic lines. The following groups are among the more important national Indian organisations in Singapore that cater to all Indians, regardless or cultural background. Singapore Indian Development Association (SINDA) – SINDA was set up in 1991 to address educational under-performance in the Indian community. It also deals with other social and economic problems faced by Indians. Singapore Indian Association (IA) – The IA was set up in 1923 by Singapore's Indian elite to promote the social, physical, intellectual, cultural and the general welfare of its members. While the association initially focussed on social and political issues faced by the Indian community, it has evolved into a private sports and recreation members-only club. Singapore Indian Chamber of Commerce and Industry (SICCI) – Established first in 1924 as the Indian Merchants Association, the SICCI is an independent, non-profit organisation with over 500 members. Society of Indian Students (SOIS) – Established first in 1999 in the National University of Singapore, the primary objective of SOIS is to provide a framework for students to interact with and to assist one another; Virtually all Indian students at NUS are directly or indirectly linked to SOIS. Participation in national life Indian Singaporeans have made their mark nationally and even internationally in a variety of arenas. Politics – Indians have been well represented in national politics, including the ruling People's Action Party (PAP) as well as opposition parties. Indians have served as two out of eight Presidents of Singapore, two out of four Senior Ministers and three out of eleven Deputy Prime Ministers. At some point, Indians have been Ministers of almost all ministries, including Foreign Affairs and Finance. The only key posts Indians have not held are Prime Minister and Defence Minister. As of June 2018, Indians were over-represented in the Cabinet