Ah-ee-shee-teh-roo
Here's a breakdown:
* Ah: Like the "a" in "father"
* ee: Like the "ee" in "see"
* shee: Like the "she" in "she"
* teh: Like the "te" in "ten"
* roo: Like the "roo" in "room"
Important Note: The "u" at the end is very short and almost silent.