From Britain or Brittany
A modern American invention, likely created by blending the surname-turned-first-name Brett with the popular suffix -ney from names like Courtney or Whitney. It ultimately traces back to the Latin term for a person from Britain or the Brittany region of France.
Less common today
Brettney isn't in the latest US Top 1000. It last peaked at #6,994 in 1992.
US births per 5-year period, 1990βpresent (SSA data).