This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
唻 combines 口 (mouth) with 來, which likely contributes the sound. The exact historical development is uncertain.
With 口 (mouth) beside 來, imagine a mouth calling someone to come, but the exact meaning is unclear.
For ライ, picture a mouth calling out a lie: lie -> ライ, but remember the meaning is uncertain.