Do you need firmographic enrichment based on the company name? Or just the name? Because if the latter, you can use Google Places.
Hi Michelle Tang,
Take a look at a couple of different vendors. Good ones should give you a trial in which they'll append a small but representative sample of your customer data with the company info stripped out. See which vendor gives you the best matches.
I've decided twice on ReachForce based on this process, but I'd also recommend you look at ZoomInfo.