In 2009, Landon was the 36th most common name given to boys in the US. The good news is that Landon is a solid, masculine name. The less good news: First of all, like many other popular boys' names, Landon is probably more popular than many parents think. Secondly, looking at other names on the list, it seems clear that the names that endure more than others are those that have an established nick name that can, in many cases, continue to be the official name of the adult. This means that while Nick, Jimmy, and Nate endure, a name like Landon might go away as quickly as it appeared.
Landon, meaning "a long hill," has seen a rapid rise in popularity. It's only in 2003 that it entered the Top 100 list, and it has since increased in popularity all the way to the current point. It's questionable, however, whether the name would survive the two issues illustrated above.
2010 Update:
A small rise to number 32.
