Han character Jì

It is a rare name character with the Mandarin reading jì.

A Chinese dictionary records it in Taiwanese personal names and equates it with 坆, citing Longkan Shoujian, an older Chinese character dictionary. In a person's name, preserve the exact written form; a dictionary's equivalence does not tell you how that person spells their name.

Where does the older name form come from?

A 2007 review links one source form to a bronze name glyph.

One 2007 note describes it as a copy or later-script transcription of a bronze glyph used for an ancient person's name; it explicitly says the character is not read sheng.