Vellayambalam Palace today houses one of the electronic companies named Keltron

Vellayambalam is a prominent junction in the city of Trivandrum and is situated on the Rajapatha (Royal Path) that stretches from Kowdiar to East Fort.

A Wayside Inn (Vazhiambalam) of the revenue department occupied the south east corner of that junction at the foot of the diamond hill. As the Maharajah often passed through that junction, the inn was kept clean and whitewashed.
Because of that white wayside inn (Vella Vazhi Ambalam ) that junction came to be known as ‘
(shortened form of Vella Vazhi Ambalam) and in due course the locality around was also named Vellayambalam