There is not much publicly disclosed about Sundar Pichai's love story in detail. We mainly know him for his achievements in the tech industry at Google.
I'm not entirely sure of the specific story behind the name Washington Sundar. It could be that his parents named him after someone named Washington, perhaps with some family or personal significance, and Sundar which might be a traditional or family - related name in his culture.
I'm not sure which specific 'Sundar Pichai Hindi story' you are referring to. There could be many stories related to him in the Hindi context, like his journey from India to becoming a global tech leader being an inspiration for many in India and among the Hindi - speaking community. Maybe it could be about his achievements being covered in Hindi media.
Sundar Pichai is a very private person when it comes to his family. There are no official reports or much information at all regarding his wife. We know he is focused on his work at Google and Alphabet, but his family life remains largely under wraps.