Scheduled import based on a scheduled job?
Search the Run As column in Scheduled Jobs.

unable to find it in Run as. src DataImport not shown as results

Every schedule has a 'run as' field (not default on the form, so you need to add it or look at it from the list). If this user isn't used as a general 'run as' user on all imports, you should be able to find the schedules triggered by this user, updating the record. 

How can we fine schedules triggered by the user. Could you pls let me know the table name of it.

Look at the sysauto table and add the 'run as' field to the list. There you can see the user that is running the job.