尔 ěr
“you; that, those; final particle”
On its own, an ordinary character; Cantonese ji5. Readings and gloss from the Unicode Unihan database.
Carries Nihonium
Transliterates syllable 1 of ni·ho·nium: nihonium → nǐ.
The reading drifted: the component is read ěr, the element nǐ.