not like this.ps1

#don't store names and members in variables like this
#don't name variables like this
#handle hashtable "already contains key" errors better than this
#don't do this

$list1 = 'list1 name'
$list1mem = @('list 1 members')
 
$list2 = 'list2 name'
$list2mem = @('list 2 members')

$vars = get-variable | ? { $_.name -match 'list' }

$varpairs = @{}
foreach ($var in $vars)
{
    $dig = [regex]::matches($var.Name,'\d').value
    $unique = $vars | ? { $_.Name -match $dig }
    $oldeap = $erroractionpreference; $erroractionpreference = 'silentlycontinue'
    $varpairs.add($unique[0].Value,$unique[1].Value)
    $erroractionpreference = $oldeap
}
$varpairs | ft -AutoSize

foreach ($addme in $varpairs.GetEnumerator())
{
    $alias = $addme.Key -replace -join'[^a-zA-Z]',''
    $groupparams = @{
        'Name' = $addme.Key;
        'Members' = $addme.Value;
        'Alias' = $alias;
        'PrimarySMTPAddress' = "$($alias)@domain.tld";
        'SamAccountName' = $alias;
        'OrganizationalUnit' = 'domain.tld/OU';
        'DisplayName' = $addme.Key;
        'CopyOwnerToMember' = $false;
        'Type' = 'Distribution'
    }
    New-DistributionGroup @groupparams
}