Andreas Johansson wrote:

> [...]
> Among younger people, three first names is quite common - I would not be
> surprised if it were the norm in the future.

In Germany (at least in the part I come from) three to four first
names were normal in the 19th and early 20th century, with one of
them (not necessarily the first) being designated the name by which
the person was called.  It was underlined in official documents.
For example, my father's father was named Simon <u>Friedrich</u>
Wilhelm Rhiemeier.  After WWII, this system fell into disuse,
and single first name became the norm.  Hence, I am Jörg Rhiemeier
and nothing else.  Only recently, giving children two first names
became fashionable; three first names are definitely uncommon,