Assalamu alikum.. I want to know the meaning of the name 'TAASEEN' ? Is it OK according islam if I keep this as my son's name?

Asalaamu Alaikum,

You can choose any name, as long as it doesn't have a negative meaning.

I would strongly recommend you read this to understand better - http://www.zawaj.com/islamic-guidelines-for-choosing-names/