>>13953889"Chaki" is probably just "Chakin", the onomatopoeia for the sound of swords clashing and Maru (circle) is a common suffix for ships, etc., it means either something beloved, or something that is complete and perfect on its own, or protects like a castle walls.
So it's like "My perfect, beloved thing that protects me and goes clang-clang". Dumb and dorky.