Welcome to the ASEAN Hive Community my friend. I think this is your first post, and usually people tell a bit about themselves such as where you're from, etc. This is a mixed culture community for us all to learn about various Southeast Asian things, so we love knowing where you're from, where you live, and that helps us understand about this flower too.
I think I have seen this plant before in Cambodia, but I'm not 100% sure. I'll ask my Khmer wife if, and if she recognizes it, I'd love to know the Khmer name.