Pretty much. Cajun is a shortened pronunciation of "Acadian", which was a region in Nova Scotia, Canada. When the British took over that particular region, they booted the French out, and they sailed south and settled in Louisiana.
Here's an article that explains it better than I can:
I'm Acadian and was a member of the Acadian Cultural Society for many years.
The Acadians didn't sail south, they were brought to South Carolina and sold into slavery
after the exile from what is now Nova Scotia. Others were put on ships with no sails and left out
at sea to starve to death. Others were placed up and down the East coast and three ships entered
Boston's harbor but were not allowed to disembark because they were Catholic. Eventually, the
state magistrate went onto the ships and found that most were women, children and elderly, and
were in rough shape. So, he ordered that they be allowed to disembark, but they had to settle out
in the wilderness areas. It was believed that the natives would put an end to them, but instead, they
got along fine with the natives and were helped by them.
Some of the Acadian slaves escaped and made their way into Louisianna, thinking that because it was
owned by the French, they'd be treated well. They weren't so went out into the bayous and wilderness areas
of Louisianna. The Acadians became known as Cajuns and created their own subculture still exist today.
The Creo's were a mixture of Black, Indian and French, but they are not part of the Acadian Culture.