Most people pronounce the Hebrew name דניאל as Dani-el.
Surprisingly enough, when the name Daniel is mentioned in Tanach (in the book of Daniel) it is written with a Tzeirei under the Yud with no vowel under the Aleph.
This would mean that we should be pronouncing it as Dani-yell.
(See here for more discussion about names which are commonly pronounced differently than how they are found in Tanach.)
(It's interesting that in English the name is spelled like Dani-el, but it's pronounced like 'Dan-yl' - emphasizing the 'y')
My understanding is that the meaning of Daniel is 'G-d is my judge'
Is this really correct being that the Tzeirei is not under the Aleph?