彅 is only in 草彅 (くさなぎ, kusanagi), which is a surname.
(sorry i didn’t give much info, i just use Wiktionary.)
edit 1: uhh here’s the link btw: 彅
JapanDict uses different sources for the content of the dictionary, which means that we don't create it directly. If you have suggestions to improve the content, it's probably better to send it directly to the creators of the content. Feel free to check the attributions page to see the full list.
In the case of the kanji content, the correct source is the KANJIDIC2 project.
I hope this helps!