Modify Name in Wrapper class with sObject type

Question

I am using code that someone else worked on. From the code, I can tell it is smart enough to recognize that the record it is processing is the current record for the lightning component. How can I then modify the name to explicitly say that for my users?

if(so.get('id') == currentRecordId seems to be the key part. so.get('name') also seems to work. How can I change the value in so.get('name')?

This is the apex controller:

//Run query and store results
    List<sObject> queryOutput = new List<sObject>();        
    queryOutput = database.query(finalQueryString);        

    //Loop through the values
    Integer level = 0;
    for(sObject so: queryOutput){
        HierarchyData ss = new HierarchyData();
        if(so.get('id') == currentRecordId /*|| level == 0*/){
            ss.expanded = true;
            //This next line is where I am trying to modify the name.
            so.put(so.get('name'), so.get('name')+': Current Record');
        }else{
            ss.expanded = false;
        }
        ss.rec = so;
        returnValue.add(ss);
        level++;
    }

    //return values to the component
    system.debug('**********returnValue:'+returnValue);
    return returnValue;
}

//Wrapper class
public class HierarchyData{
    @AuraEnabled
    public sObject rec{get;set;}
    @AuraEnabled
    public boolean expanded{get;set;}
    public HierarchyData(){
        expanded = false;
    }
}        

The top part of the code is just defining the variable finalQueryString, which works as expected.