I need a few names... Help?

I have a few characters. Shadowhunters to be exact.
First: Age 17, 5'6", fairly skinny, light brown shaggy hair, blue eyes, male. Shy, keeps his life to his self, but selfless, kind and sassy under his breath. If you do get to know him he can be very open and funny and quite a trickster sometimes. He still hides things if you are close to him. He sasses a lot of people under his breath if he thinks you can't hear him.
Second: Age 8, 3'6", skinny as well but just as some small children are, short blond hair (both parents had blonde hair but it turned brown when they got older. The same will go for their kids). He's a spunky kid with a ton of energy, and likes to do anything athletic. He's pretty much just a sparkly little kid

^the second one is also male, and all the people I need names for are brothers and sister
Third: Age 4, female, blonde hair and its in little coils of curls, also blue eyes, she's still a baby so she's a little tubby. She seems to have two personalities. One, that is outgoing, fluffy, sparkly and full of energy when she's with her older brother (Number 2) and the other one when she's with her older sister: calm, reserved, but still slightly more outgoing than her older sister. (Older sister already has a name: Ellowyn)

@ThiaL Lol! Those are great ideas, but for the first one, (this is totally random) Barrett is one of my teacher's names! I'm amazed that you came up with that one

But I will definitely have to pick and chose through the names, they're all really cool and original

@ThiaL I know right? I'm supposed to be writing an essay in his class right now, but guess who's procrastinating!