the Berasit Hebrew Dictionary

During the Roman Empire, much original Hebrew pronunciation was lost, being overwhelmed by Latin convention.

For example Classical Latin relied on the letter 'V', which stood for both the /w/ and /u/ sounds. We can see the influence of this in the Hebrew letter 'ו' which is often pronounced /w/, /u/, or /o/.

In Classical Latin 'b' and 'v' are pronounced the same. This is still the case in Spanish which derived from Latin.