https://familysearch.org/search/
(Free) has 681 records for it. By comparison they have over 150,000 for "Pack", which I know from personal experience is uncommon, and over 28,000,000 for "Smith". So, chances are it was spelled differently in the old country.

Most of the ones on the first 20 results who were not born in the USA were born in Italy. With only 681 records it's hard to tell, but I'd bet Italian.

There are 10 records from the collection "Italy, L'Aquila, Civil Registration (State Archive), 1809-1865, 1911-1943". The rest of the collections are in the USA, except for one from Argentina, with just 2 records. One or more of those records may be your great grandfather, if that's a name in your family tree.

You meant "national origin", but we know what you mean. "Nationality" is like "citizenship". There are people whose national origin is everything from Albanian to Zulu whose nationality is the US of A. They live here, vote here, pay taxes here and, sometimes, send their sons off to fight in a uniform with our flag on the shoulder. A lot of people make that mistake. A lot of people confuse "cement" and "concrete", too. It happens. Neither is a capital offense.

Please don't forget to choose a best answer. It doesn't have to be mine. 10 points aren't much, but they tell us you read the answers and we didn't flush 10 minutes of research and typing down the toilet.

Back in the 1950's an adventurer named Thor Heyerdahl sailed a raft from Peru to Polynesia to see if the Polynesians could have come from South America. The fellow who wrote "Seven Daughters of Eve", about using DNA to trace where people came from, said the Polynesians and Melanesian came from South-East Asia. There isn't any evidence at all that the South Sea Islanders had any contact with North or South America.

DNA companies have been known to make mistakes, though. If you could get your mom and dad to also take the test, and one of them has twice as much Pacific Islander DNA as you do, you'd be more certain.

Find a Family Search Center here:
https://www.familysearch.org/locations

These are the best places to start. They are small rooms in large Mormon churches. That puts people off. Don't worry. I go to one and I'm not even Christian, let alone Mormon. They don't try to convert you. In fact, unless you ask a direct question about it, they don't mention their religion. You do have to be reasonably respectful; don't wear a "Party 'til you puke" T-shirt.

At the one I go to, volunteers outnumber clients most evenings. They will be delighted to see you. They have PCs with fast access. One of the volunteers may have an Ancestry subscription. They can get you any microfilm they have at Family History Central in Salt Lake for a modest fee. They will charge you a nominal fee for printing, if you find something you have to print; just enough to cover their toner and ink. Other than that, it is free - and the volunteers are usually experienced enough they would get $30 an hour or better if you hired them as tutors on the private market.

They won't do all the work for you, but they will show you how it is done, and share some favorite web sites with you.

The second best place would be the Local History & Genealogy room of the main public library there in Charlotte. Call first and see if someone from the Genealogy society will be there on a given day. Your parents may be willing to drive you there, or let you take the bus.

As a side note, since you mentioned Ancestry, the "Public Family Trees" on Ancestry.com can be accurate, but they don't have to be. I've found valuable clues - CLUES, not facts - in them, but I've seen some real howlers. It isn't uncommon to see people on them listed as the father (or mother) of someone born 10, 20 or 30 years after the "parent" died.

Write to me via my profile if you want a classic example. I'm getting dangerously close to violating the "no chat" rule.

If they are already born, they'd keep their old name until you changed theirs, too.

If they haven't been born, they would get your new name when they were born. That happens pretty constantly; Joan Smith marries Ralph McCorkle, changes her name to Joan McCorkle, and she and Ralph set about making baby McCorkles.