The last syllable is pronounced like "et" in "et cetera".
The "baa" has a long "a" sound (like "aww"), while the "rak" has a sharp "a" sound (like "rack"). The Persian Birthday Song Tavallodet Mobarak
Iranians have a specific birthday song, often sung to a lively, upbeat tune. The most famous lyrics repeat the phrase: The last syllable is pronounced like "et" in "et cetera"