ServerName wildcards in Apache name-based virtual hosts?
Use ServerAlias, rather than ServerName alone:
ServerName somename.dev
ServerAlias *.dev
If this can help, just to complete a bit Mo's answer:
Wildcards in ServerAlias also works on partial domain names, such as
ServerName somename.dev
ServerAlias *-mysite.dev
It saved my life recently ^^ (a main site with subdomains for each sub app such as admin-somename.dev, bo-somename.dev, api-somename.dev...)