Distribution of My Family Name

The name "Gerlach" isn't as rare as I thought. Neither is it common. The distribution has been calculated by using data from German telefone-books. If you want to know something about the distribution of your own familyname in Germany go to http://christoph.stoepel.net/Geogen.aspx.

'Namensverteilung' means 'distribution of name'
'weniger als' means 'less than'
'Vorkommen' in this context means 'people counted'
'bis' means 'up to'
'mehr als' means 'more than'