A three-syllable transliteration:
孟 mèng for 'Mom-/Mon-',
波 bō for '-bo-/-po-',
斯 sī for the closing '-s'. Could correspond to Mompós (the Colombian colonial town on UNESCO's list,
圣克鲁斯德蒙波斯), or a personal name like Mombos. The
斯 ending is a near-universal Mandarin marker for foreign names ending in -s.