Don't suppose you can import from excel in some way?
Not directly.
Some computer Address Books and Google's Contacts can import .csv files. Excel can export .csv. This will only work if you're Excel file is formatted correctly. If you just cobbled it together yourself it may not import at all, let alone to the right fields.
(there is a workaround for this using Google, but it's a pain, and would require a lot of editing in Excel)
If the file imports correctly then you have a few choices.
If you used Google, you can sync that Google Account to the iPad; or you can export from Google to the vCard format.
Depending on the Address program on the computer you may be able to sync it with an online service like iCloud or Google, and then sync the iPad to those services as well: or export the addresses in vCard format.
If you export as vCard you can:
Mail it to the iPad and then use Open In… from the Mail app to import it into contacts.
(if you use iCloud) Go to icloud.com on a computer, open the Address Book app, and import the vCard file.
There are probably a few other methods, but that's all I can think of.
Well, other than manually entering all the stuff again. If you are going to do that it might be easier to get the iCloud account (if you don't already have one) open icloud.com in a browser and Excel side by side. Then, lots and lots of copy&paste.