Here is the site for Santa Clara County. Just click on the link for View or Pay Property Tax and you can put in an address and get the name of the owner.
I've always been able to get the names of the property owners as well as their mailing address by calling the county assessor's office. Now, here is the one caveat I have for you, if the home that you're trying to find is a foreclosure, the only information you'll get is the mailing address for processing the property tax bill, and not necessarily the name or address of anyone who can help you buy this home if you are interested.
Typically, if a home has been foreclosed, you will need to wait for the new owner or the bank--if the bank reclaims it--to come forward. If the bank has taken the property back in foreclosure, the home will most likely be assigned to a Realtor to be sold in the near future at which time the property will appear on the MLS.
Area Pro Realty
P. S. Here's the number for the Santa Clara County Tax Assessor's office, owner inquiry line, 408-299-3227.
It is free, although you've got to sign up via an email account.
Hope that helps.