Via conditional formatting
Try this:
Assume you have in A2: =SUM(B2:C2)
Select A1 (where you have the name)
Click Format > Conditional Formatting
Under Condition 1, set it as:
Formula is | =A2>3
Click Format button > Font tab > red/bold > OK
Click OK at the main dialog
Test it out, input some numbers into B2 and C2
If A2 evaluates to > 3, the font of the name in A1
will change to red/bold
(I'm assuming your "1A", "2A" means cell A1 and A2 <g>)