Sunbeam proves one of Hasbro's tenets--reusing a licensed name across their franchises. Yes, there's a Transformer (Micromaster/Mini-Con) with this name. XD It's not unusual, Hasbro also lets a lot of names slip and don't want to pay for the license to renew them--such as for Hot Rod--and the only reason they have it back now is Michael Bay paid for it to use the character in "The Last Knight".

Sunbeam is a G1 'Pony. A lot of the G1 releases had piles of Unicorns in them. I don't have Sunbeam, but a friend of mine had Sunbeam. I do have a sticker book with Sunbeam in it, though.

MLP and character belongs to Hasbro.