בחיי; Bachya or Bechaye? Steinschneider "defends" the traditional pronunciation.

Link.

Interestingly, Google returns only 2,200 results for "rabbeinu bechaye" vs 11,700 for "rabbeinu bachya." I tried other titles and permutations, but the results don't really change. Anyway, next time your rabbi quotes Rabbenu Bechaye, don't cringe. Think of Steinschneider.