Because in the Dragon Ball history, the saiyans home planet was destroyed by Frieza. Leaving the Saiyan race on a border of extinction.
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Yes there are but not that many
No unfortunately not. But hopefully at some point there will be one.
No, because in the manga and anime it is stated the namek dragon balls can only bring back to life people who died within the past year. Since saiyans were destroyed by freeza before the timeline of dragon ball, that is obviously more than a year.
It is never known if Saiyans have last names or not because we are never told. This is the same with Vegeta.
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