If I understood correctly the question, it is not a control from the "control"
toolbar but from the "form" toolbar. It is quite different.
There is no problem indeed to change  the name of an activeX control (the one
from the control toolbar).
But, I was surprised to see that this is not the case with a control added
from the "form" toolbar. I do not see where to change the default  name in this
case.