Hi Luis,

Not sure what you mean by

What is the best way to import many data files and names this files

I assume you want to have the symbols generated in dd to be set to the contents of the corresponding file.

Is there a reason to hardcode the Range? Why not Range@Length@names?

dd = Symbol /@ ("data" <> ToString[#] & /@ Range[325])

Then

MapThread[(#1 = #2) &, {dd, allData}]

You are welcome.

Rather than setting individual symbols to the content of a file you might want to consider using an Association / Dataset instead. If you do data analysis that requires data from multiple files then using individual symbols is very cumbersome and error prone. One way to do this

data = AssociationMap[Import, names] // Dataset

The keys are the file names (much better than data1, data2, ...) and the values are the content of the corresponding file.