I've never seen
Andre used by black or mixed-race South Africans, but it's widely used by Afrikaans-speaking white parents. English ones stay with
Andrew. And I don't know how Americans pronounce it: here,
Andrew has a short a as in cat, and
Andre has a long a, as in far but without the -r, or the sound doctors are said to elicit when looking down throats: 'say "Aaah!"'. Ahndray, therefore.