Well you won't get manager's name directly - you do not want to ;-)
You are probably importing Persons, right? Each Person can have associated manager Person. In import mapping you have to define a key by which you are looking for that manager Person. If you store a LDAP DN with your persons (for example as a Source ID) that this DN (CN=MANOJGARG,OU=SALES,OU=SALES AND MARKETING,OU=HUTCH-DEL,DC=HUTCHINDIA,DC=com) you map your [manager] attribute to Manager->Source ID. By that SD will associate Person with such Source ID with the current Person.
Sounds complicated but hope you'll eventually understand. To summarize, this mapping is important: [DN]->Source ID [manager]->Manager->Source ID