This worked for me.
1. Determine the region you want to titles for.
2. Press alt+m, then m; JAWS says define name.
3. For column and row titles, type title
4. without a space, type the period (punctuation mark).
5.Type the first cell of the range you want titles spoken for.
6. Without a space, type another period.
7. Type the end of the range and press enter.
The command, to label row and column titles for a3:f20 would look like this: