For Thayil there are 25 on Yasni with different names.
Among the most common last names on Yasni Thayil is on position 4502.
In an old out of print Malayalam dictionary, "Thayil" means beautiful, beautiful girl etc, it has been used among the Malayalee community as a family name or house name irrespective of religion or caste.
(Sent from: Anish Thayil)