"Deskmate" itself is a fantastic and straightforward name for a stationery channel! It's:

Clear: Immediately tells viewers the channel is related to items found on a desk.
Friendly: Evokes a sense of companionship and helpfulness, like a good deskmate in school or at work.
Memorable: Short, easy to say, and likely to stick in people's minds.
Versatile: Can encompass a wide range of stationery-related content, from reviews and organization tips to creative uses of supplies.

Directly as your channel name: "Deskmate"
With a subtitle: "Deskmate: Your Guide to All Things Stationery" or "Deskmate: Reviews, Tips, and Inspiration"
As part of your branding: You could refer to your viewers as your "Deskmates."
In short, "Deskmate" is a strong and effective name choice for a stationery channel. It's simple, relevant, and has a positive connotation.

What are your thoughts on just using "Deskmate"? Are you leaning towards something more specific, or do you like the broad appeal of this name?