It coalesces with a, e, i, o; but has rather in these combinations the force of the w consonant, as quaff, quest, qUIt, qUIte, langUIsh; sometimes in UI the i loses its sound, as in jUIce.
"A Grammar of the English Tongue"
Samuel Johnson
A lady called UI, and her brother Luamaa, fled from Papatea and reached Manu'a, but alas!
"Samoa, A Hundred Years Ago And Long Before"
George Turner
The sun looked at lady UI, desired to live with her, and so he put an end to the sacrifices, and took her to wife.
"Samoa, A Hundred Years Ago And Long Before"
George Turner