The Hydrangeaceae Family was named and described by Barthélemy Charles Joseph Dumortier in Analyse des Familles de Plantes in 1829. As you can tell, the family was named after the genus Hydrangea.
Plants of the World Online lists 8 accepted genera but the Wikipedia has an alternate story which is more complicated.
For more information about this family of plants, please click on the links below. The links take you directly to the information about the family.