大概是他喜欢辣而我姓谭
[dà gài shì tā xĭ huān là ér wŏ xìng tán]
'Probably Because He Likes Chili While My Surname is Tan.' In Mandarin, 辣 (chili) sounds similar to 姓辣 (the surname La). So this name is playing with sound, jokingly saying the other person likes spicy food whereas they have the surname of Tan.