In St. Kitts, Joseph Veira (born in Madeira, Portugal) had a daughter named Agnes Veira who married a Claude Johnson. They had several children, one of whom is a Jackie Johnson who now lives in Canada. I'm certain that the Johnsons and Veiras were in Halfway Tree, St. Kitts; but Halfway Tree might be just a region of Basseterre.

If this sounds like a connection, let me know and I can acquire more information from my father for you.