Yeah, looks like St Aug. and Bermuda. What are you looking to do with it? There's really nothing out there to eliminate the Bermuda without killing the St Aug. If it looks good to you, I'd just keep what you got going. Or you could slowly transition to a full Bermuda lawn (as long as your property has plenty of sunlight).
It's also hard to have both grasses look their best since Bermuda likes to be 1" or under and St. Aug likes 3.5" or higher