Hi, i have an old ipad and wish to give away but I need to login my apple ID and password that were used to set up the old ipad, and I have no way to figure out what was the old apple ID. (i have tried many different email and password and none match

If necessary, if you are the original owner, contact Apple. Apple can remove the ID  if provided the required paperwork to include the original purchase receipt with the serial number on it. 

Request additional support for unlocking your device.    -

You used to be able to take the device, the original purchase receipt with the serial number, and a photo ID to the nearest Apple Store (if it has reopened) and have them remove the ID. This may have changed, so call the store before going to make sure they can help.

Genius Bar Reservation and Apple Support Options - Apple.   -

Hello ~ Take a look here:

If you forget your Apple ID or password

Later once able:

Sell or give away your iPad - Apple Support

~Katana-San~