The last volume to Death Note is volume 12.
In number 12 (the last one)
Death Note Volume 13 isn't on "how to read manga" it's on how to read the Death Note, which is a book in the story of the manga Death Note. Volume 13 is sort of like a "bonus disc" to the Death Note series.
From Death Note, Light's last name is Yagami. Light Yagami
It is not actually a manga, it's a guide to Death Note. It has profiles of the characters ETC.
There are three "Death Note" live action films : 1)Death Note , 2)Death Note: The Last Name and 3) L: Change the World .
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The beginning of Death Note Volume 12.
He is a Shinigami and has no last name.
The song at the Death Note The Last Name credits is Snow, Hey Oh by Red Hot Chili Peppers.
As revealed in Death Note 13 How to Read, his full name is L Lawliet.
She gets kidnapped in the end of volume 11, and the events of the kidnapping take place in volume 12
In the series, it was never confirmed the last time that a shinigami had dropped their Death Note until Ryuk. If we are assuming that you are asking from this date, the last shinigami would be Ryuk.