"I want the variable to be changed according to the file name.."
That would be about the worst approach to importing data.
Putting meta-data into variable names is a sign that you are doing something wrong.
Meta-data is data and belongs in variables, not forced into variable names. Badly designed data (with meta-data in the variable names) makes accessing the data slow, complex, inefficient, obfuscated, buggy, and difficult to debug:
The MATLAB documentation shows examples which use simple and efficient indexing to store imported file data:
Is there a particular reason why you cannot use simple, neat, efficient indexing and a cell array? (or a table, struct, etc)
