stehn-hoy
Here's a breakdown:
* Stehn: The "st" sounds like the "st" in "stone." The "ehn" sounds like the "ain" in "rain."
* Hoy: The "h" is silent. The "oy" sounds like the "oi" in "boy."
So, it's pronounced like "stehn-boy" with a slightly softer "o" sound in the second syllable.