Thai ประจำ

← Khmer ប្រចាំ (cognate)

← Old Khmer pracāṃ (derived)

← Old Khmer cāṃ (mention)

← Old Khmer cāṃm (mention)

← Old Khmer cām (mention)

← Old Khmer caṃ (mention)

← Old Khmer cam (mention)

→ Thai จำ (mention)

→ Thai ใบประจำต่อ (compound)

→ Thai ประจำเดือน (compound)