About the De Abreu Surname
Some records give Abreu; others give De Abreu. Both point to the same Portuguese family name. The name is habitational, pointing to “from Abreu”. De Abreu simply joins the particle De to Abreu, a habit common in Portuguese naming. Census takers and immigration officers often wrote what they heard.
You may also find the name written Abreo.
A coat of arms belongs to a particular family line rather than to everyone named De Abreu, so the heraldry linked to Abreu is a starting point, not an automatic right. Research your De Abreu family history with a full surname report and painted coat of arms.