Rename AD groups using two PowerShell arrays - arrays

Question

I'm trying to rename existing AD groups in this way.
AD groups starting # to be renamed to the same name without #. For example , I have #dl1 and I wish to get it renamed dl1 (omitting #)
Im trying to rename following four users first.
I have written two arrays, in this manner. ($myArray and $myArray2).
$myArray =#(
$data = Get-ADGroup -Filter {name -like "#*"} |select samaccountname
$data.samaccountname | foreach {$_.split("#")[1]
}
)
$myArray2 =#(
$assdf=Get-ADGroup -Filter {name -like "#*"}
$myArray2 =#($assdf)
$num=0
foreach($a in $assdf)
{
$myArray2[$num]
$num=$num+1
}
)
If I print $myarray it gives exact results, that I wish, in this way.
and also if I print $myarray2 it gives the desired results in this way,
the missing piece of the puzzle is combining those two arrays to run the final command that is
set-adgroup -identity (members indide $myArray2) -samaccountname (members indide $myArray)
For hours, I have tried numerous methods to get set-adgroup .. using for each loop etc.
for example,
$a=0
foreach ($item in $myArray2)
{
$nameto_replace=$myArray[$a]
Set-adgroup -identity $item.samaccountname -samaccountname $nameto_replace
$a=$a+1
}
Can anyone please shed some light, please? I am totally out of ideas now. thanks in advance

Answer 1

There is no need to perform Get-ADGroup twice, where you can use it once and loop over the results in a ForEach-Object loop:
Updated as per Aravinda's helpful observation
Get-ADGroup -Filter "Name -like '#*'" | ForEach-Object {
$newName = $_.Name.TrimStart('#')
Write-Host "Renaming group $($_.Name).. to '$newName'"
# replace only the SamAccountName
$_ | Set-ADGroup -SamAccountName $newName
# or replace multiple properties at the same time.
# You need to use the LDAP names here, so mind the casing !
# See http://www.selfadsi.org/group-attributes.htm
# $_ | Set-ADGroup -Replace #{sAMAccountName = $newName; displayName = $newName}
}
You can limit the search to a specified OU if you want by adding the OU's DistinguishedName with the -SearchBase parameter

Answer 2

Theo's answer is fantastic!
Following is the one finally I used derived from theo's answer.
Get-ADGroup -Filter "Name -like '#*'" | ForEach-Object {
$newName = $_.Name.TrimStart('#')
$_ | Set-ADGroup -Replace #{sAMAccountName = $newName;displayName = $newName}
$_ | Rename-ADObject -NewName $newName
}
If you try using set-adgroup to change 'name' and 'CN' and it gives below error.
"Set-ADGroup : The directory service cannot perform the requested operation on the RDN attribute of an object"
To change multiple attributes, especially including Name and CN, combination of Rename-ADObject and Set-ADGroup can be used.