Isengard no!

[Snowdog]

Originally Posted by William Cloud Hicklin

It's not EYE-sengard. It's about halfway between EE-sengard and IZ-engard.

Source?

According to the Encyclopedia of Arda, Isengard is pronounced as 'eye'sengard'. Maybe that was where PJ got the pronunciation?

Wikipedia has it as 'aɪzənɡɑːrd', and someone on Reddit says it's 'Ee-sen-gard'.

Here is a good discussion I found on Boardgamegeek. There is listed 'EYE-zen-gard, 'Eisen-gard', and the one I like and tend to use is in Tolkien's reading the march of the Ents ("To Isengard with doom we come!"), he definitely pronounces it 'Eye'-zen-gard.