钉钉 (ding4 ding1) mandarin fix a nail
叮叮 (ding1 ding1) mandarin, onomatopoeia: the sound of a small object
丁 (ding1) mandarin population
丁丁 (ding1 ding1) mandarin, common nickname
定定 (ding4 ding4) mandarin make stable; calm down