繼承自原始占語 *bulaːn，繼承自原始馬來-波利尼西亞語 *bulan，繼承自原始南島語 *bulaN。
phian¹¹
Thurgood, Graham (1999) From Ancient Cham to Modern Dialects: Two Thousand Years of Language Contact and Change[1]，Honolulu：University of Hawaii Press
