Your question is missing the actual problem you need help with or what is failing.
I see you're using Export-Csv, I would assume you meant to use Import-Csv.
If you want to store the content of a CSV and set that content to dynamically created variables, this is how you can do it:
$numberOfvariables = 5
$csv = Import-Csv path/to/csv.csv
0..$numberOfvariables | ForEach-Object {
Set-Variable -Name var$_ -Value $csv
}
Note that, I'm using Set-Variable instead of New-Variable, both serve the same purpose in this example however if you re-run the script without removing the variables you would get the exception A variable with name 'var' already exists. using New-Variable unless you use the -Force switch.