Some other options might be 'Forbidden Chronicles', which gives a sense of something that shouldn't be known. Also, 'Cursed Memories' has a rather dark connotation. And 'Gloomy Reveries' can be a name that implies a private story full of rather somber or disturbing thoughts.
The 'Grim Gossips' could be a good one. It gives the idea of sharing somewhat dark or cynical bits of news or thoughts privately. Another could be 'Shadowy Tales' which implies stories that are a bit on the darker side, hidden away like shadows. And 'Morbid Musings' is also suitable as it suggests that the content might be related to rather dark or gloomy musings.
Sure. 'Nocturnal Musings' is a good one. It makes you think of thoughts that happen in the dark of night, which can often be a bit on the darker side. 'Sable Narratives' also works, with'sable' meaning black or dark. 'Murky Reminiscences' gives the idea of memories that are a bit clouded and perhaps not so pleasant.
You can start by looking at common dark humor themes. Death, for example, can give you names like 'Deadpan Diaries' or 'The Mortuary of Mirth'. Or if you like the idea of things being hidden or secret, combine it with humor. 'Secretly Sinister Smiles' or 'Hidden Humor of the Haunted'. Also, consider using alliteration like 'Dreary Droll Dialogues' which not only sounds catchy but also gives a sense of dark humor.
Friendship's Hidden Hideout. This name shows that the private story is a hidden place where the secrets and special moments of your friendship are stored, away from the rest of the world.
Some names might be 'Faithful Reflections'. This name implies that the private story is about the deep and faithful thoughts and experiences within the Christian faith. 'Divine Inspirations' could also work, as it shows that the story is inspired by God. Or 'The Holy Happenings' which simply tells that it's about things related to the Christian holy or sacred.
Other possible names are 'Personal Parable', 'Secret Script', 'Intrinsic Story'. 'Personal Parable' can be used if the private story has some sort of moral or lesson within it that is personal to the teller. 'Secret Script' makes it seem like there is a written or unwritten script of a story that is secret. 'Intrinsic Story' gives the feeling that the story is an essential and private part of someone's life or experience.