Weapon Name Puzzle

|The Volokh Conspiracy |

Which weapon was named after a fruit?

Which two weapons' names come from Czech?

Which weapon was named after a Norse woman's name?

Which two weapons share the same name, though they are about as different as weapons can be? [UPDATE: Some of the commenters were discussing various weapons systems that fit this, and I appreciate their points; but I'd like to limit this question to personal weapons, of the sort that one person would carry.]

None of these, except for one of the two weapons from the last question, is a brand name.