Adding Values Against Unique Names

I have a spreadsheet with a series of names in a column and respective dollar values in a separate column. I would like a formula to automatically total the value spent against a particular name (without having to enter the name as a value each time).

Example

John Doe 3.89
John Doe 1.27
John Doe 0.98
Amy Smith 1.56
Amy Smith 2.29
Amy Smith 1.11
Alex Brown 0.67
Alex Brown 4.56
Alex Brown 8.87

I would like a formula to automatically populate a column, spreasheet, etc as follows:

John Doe 6.14
Amith Smith 4.96
Alex Brown 14.10