Baby Name Wizard has a few interesting visualization tools for mapping the prevalence of infants' names over time.
Here you can see how "J" names for boys have changed over the past 130 years.

"Jacob" is apparently the most popular name for boys at the moment.
My last name is Slaybaugh.
Some in my family have wondered what it means in its (presumably) Germanic origin.
Does it mean 'Limp' or 'Sleeping River'?
Here are my findings.
This site
http://www.rootsweb.com/~pasomers/amsurs.htm
says that one common Amish name is Slabaugh (Schlappach)
I've seen other similar names, such as Schlabaugh and Schlabach