I hope someone can assist with this......

I have a spreadsheet with column A containing words, and column b containing
numbers

A B C D
(TOTAL)
JOHN $123.00 GARY
GARY $456.00 PAUL
PAUL $789.00 JOHN
JOHN $345.00
GARY $567.00
PAUL $678.00

I need a formula for column D to add totals for each name. I have tried
SUMIF(A2:A7,"JOHN",B2:B7) but it doesn't add the amounts, only the first
instance of JOHN is displayed by the formula. I have tried various other
formulas found here in this discussion group but the SUMIF above is about the
closest I've come to any joy, all the others display an error message.

any suggestions would be greatly appreciated, this is really doing my head in!