Possible meanings are 1) "I will never mention Yahweh or say anything about him" or 2) the word "name" represents authority. Alternate translation: "I will no longer speak as his messenger" (See: [[rc://en/ta/man/jit/figs-metonymy]])
Here the words "heart" and "bones" represent Jeremiah's innermost being. Jeremiah speaks of being unable to not speak Yahweh's message as if Yahweh's message were a fire that burns within him. Alternate translation: "Yahweh's word is like a fire that burns deep within me" (See: [[rc://en/ta/man/jit/figs-synecdoche]] and [[rc://en/ta/man/jit/figs-metaphor]])