I found this interesting stone at Hazelwood Cemetery in Springfield, MO.
Many thanks to Chris (a Find A Grave contributor) for the translation. He transcribed it this way:
"They hail from Guangdong Province, China, so I will assume their names are in Cantonese. The surname for both is Lau. (In Chinese names, the surname comes first.) On the left, the man's given name is Tai Tou. On the right, the woman's given name is Mei Chan. They are most likely father and daughter."