Is there an option to add prefix to the subclip names?

Yes, in eMAM you can set prefix for subclip names.
In the Subclips widget, click on Set Prefix option under the pull down menu.
Set Prefix option allows eMAM users to set prefix for subclips which will be auto populated for subsequent subclips.
Enter the Standard prefix & TX prefix name and click on Add.
After setting this prefix, when users add new subclips, the subclip name will be starting with this prefix and will be displayed in this convention prefix_1, prefix_2. e.g.: STAD_1, STAD_2, STAD_3 and so on.