Kaila is a Punjabi surname, and the name of a "gotra", or clan. One respondent on this forum -
http://punjabi.net/forum/archive/index.php/t-1775.htmlclaims that it is the name of a village in the Punjab. I know that Jat gotras often use the name of the village of origin as the clan name. The Jats are a large community of Northern India, particularly in the Punjab.