In this case, this Himiko was formerly the Capital class carrier, YSS Explorer, lost a few months after it's launch, whether to a particularly powerful macrometeorite storm or an organized attack on an underequipped and not yet fully combat ready vessel is unclear.
In Senti tradition, the first name of the last member of the previous crew to die becomes the name of the ship.
This goes to a throwaway NPC named Taii Himiko Yamamoto, who died at her post at the helm and was one of the only identifiable bodies found.
Many Yamataian systems were destroyed in whatever event rendered the Explorer a rotting hull, and the computers self terminated when the Senti managed to restore power, meaning even they are unsure of what happened, and would be extremely interested in an official report on their home's history.