How to avoid underscore at the end of variable name in the workspace , while importing using mdfimport function

I am using mdfimport function to import many signals fro my mdf log file. I am getting variable name _1, variable name _2 in the workspace, probably because of the different sampling rates of the signals. But I would like to have only the variable name with out any underscores at the end. Is there any way?

syntax: mdfimport(fileName,importlocation,signalselection,timevectortype,ratedesignation, additionaltext);

I tried giving empty braces[] at the rate designation field, but it didn't help me.

[KSSV]

Cant you do this:

new_name = old_name;
clear old_name;