The Internet has many general search engines, but genealogy research requires a more precise search tool. These genealogy search engines search only family history sites. So your results are more relevant than the results from a traditional search engine.
Ancestor Search
This portal for surname searches allows you to search big sites like Ancestry.com and smaller databases.
Genealogy Gateway
This site searches 50,000 genealogy records for one surname.
GeneaNet
Search more than 47 million records and contact other genealogists who are researching your surname.
GenSource
Search several online databases from one site.