The original charge sheet for all eight Marines (posted here) had nine specifications of Voluntary Manslaughter for SSgt Wuterich.
As you'll see at the link above, the specifications listed eight people by name (from houses 1, 2, and 3) and then the ninth specification gets vague: "willfully and unlawfully kill one or more unknown persons, located near a white car, at or near the intersection of Routes Chestnut and Viper, by shooting them with a loaded M16A4 service rifle."
Dela Cruz testified there were five at the car so that would give a total of 13. But I'll let you know if I get more up-to-date charge sheet or more information.