The शीर्षक Servaikkarar, used by Mukkulathors and derived from Chera Avaikkarar,
means people who served in Chera avai. Cheraavai was also called as Enperayam. 

Once Chera country was ruled by eight Chera kings who combined their armies and chose one king to lead them. Avai(Where all eight kings will meet together) is known as Enperayam or Chera Avai..

People belonging to Cheraavai are called Cheravaikkarar or Servaikkarar. One of the famous kings with this शीर्षक, Maruthu Pandiyar Servaikkarar, belongs to Agamudaiyar.

Kallar also have the शीर्षक Servaikkarar and Servai, showing their relation with Cheras.

Also there were many proofs for Kallar warriors and chieftains linked with Cheras. One of the famous chieftains is Paluvettaraiyar who was in close relation with Cheras. He later joined with Cholas and was responsible for a number of benefactions to the temples at Paluvur and was related to the Chola by marriage.

Surnames
Chola
Tamil copper-plate inscriptions
Link With Cheras