Illam is a Malayalee lineage system used for classification and identification of castes in Kerala, South India. There are mainly two castes which used Illam as their house. They are Thiyyars and Namboothiris. The House of Namboothiries (the Brahmins of Kerala) are also called the Brahmaalayam or Mana. The house is built according to the canons of Vaasthusaasthram, meaning architecture in Sanskrit language.In Thiyyar system there are 8 illam from where their origin are believed to be from . The well acclaimed history book "Castes and Tribes of Southern India" by Edgar Thurston (1855-1935) clearly describe the eight illams of Thiyya . Eight illams of Theeyars in North Malabar, as per this book, are:-

  • Nellikka
  • Pullanhi
  • Vangeri
  • Koyikkalan
  • Padayamkudi
  • Tenamkudi
  • Manankudy
  • Vilakkan Kudi