According to the book Weaponry: An Illustrated History, by Chuck Wills, between the late 16th century and the advances in repeating firearms in the mid 19th century, blades or clubs were often fitted onto guns, because only one shot could be fired from the gun.
Some of the first included the German axe-pistol, made in the central European region of Silesia.
Later, a pistol-sword combination formed in the mid 18th century, which was apparently used mainly by marines and naval officers in boarding engagements at sea.
Additionally, Dumonthier & Sons produced several knife pistol combinations.
Even some shields were fitted with barrels, sometimes designed to look like a spike, and other times placed in cleverly concealed holes.