There are events which bring new villagers - the best known is the barrel o' babies. I recommend starting a new village, and checking in every 24 hours (You have to check in each day to get the maximum number of events, and maximum chances at more babies) to check for events that might help you repopulate.

Additionally, if you want to use an exploit -- which is almost a cheat -- you can back up your save-game files. After doing that, load your game, and if the event isn't to your liking, quit, restore the files, and load again, until you get your barrel.