Same /i/ sound: only the spelling changes. After the linking u and after qu, write y (tuy, quý). In some words i and y are free variants: kỳ or kì, lý or lí. Not to be confused with ai / ay, where the length of the a changes.
tuy · quý · kỳ · kì
o or u for the linking sound?
The small linking sound /w/ is written o before a, ă, e (hoa, hoặc, hoe) and u before the other vowels (huế, tuy). After q it is always the u of qu, written once: quan sounds like toán, quân like tuần.
hoa · hoặc · khoẻ · huế · tuyết · quan · quân
Quick answers
How do you pronounce Huy?
Block by block: i → uy → h → huy. Tone: ngang (no mark · level). Read each block aloud, then compare with the recording, in a Southern or a Northern voice.
What tone is Huy?
ngang (no mark · level)
Is Huy said differently in the South and the North?