How can we find the object name based on the parent Id in the easiest way?

Hi Mohit,

One liner answer to this question can be by using below line we can get object name based on parent id :
List<Schema.ChildRelationship> lstCR = <parentID>.getSObjectType().getDescribe().getChildRelationships() ;

Below is the detailed example to get child object names (list of string) by parent ID :

ID idToGet = '<Any Parent Object ID>';
List<string> lstChildObj = GetChildObjects(idToGet);
System.debug(lstChildObj);

// Below function accepts 18 digit parent ID and returns list of Child Object 's API name.
public List<String> GetChildObjects(ID parentID)
{
List<string> lstChildObjects = new List<string>();
Schema.DescribeSObjectResult parentDescribeResult = r
String sObjName = parentDescribeResult.getName();
System.Debug('Parent object name : ' + sObjName);
for (Schema.ChildRelationship childRel: parentDescribeResult.getChildRelationships())
{
lstChildObjects.add(childRel.getChildSObject().getDescribe().getName());
}
return lstChildObjects;
}

Thanks,

Extentia