Can you give us a bit more info to work with? I take it from your screen name that Jake's middle name starts with a D... Can you tell us what it is?  And give us a sense of the sound of your last name?  Also, if you have names that you like in certain ways, but not others, etc., that can give us a sense of your tastes.

I agree that it's hard to to tell without a bit more context, but here's a shot in the dark.

Boys:

Josh

Zach

Girls:

Leah

June

Without some info on what other names you like and what your surname sounds like it's pretty hard to narrow it down, but how about:

Boys:

Luke

Ryan

Hank

Ethan

Liam

Max

Tyler

Nick

Joshua

Girls:

Emma

Hayley

Hannah

Sophie

Ella

Zoe

Lucy

Paige

Amelia

I agree more information would be helpful.  I think Jake is one of those really versatile names that works well within a variety of styles.

Western: Coby, Wyatt, Levi, Brody, Clementine, Daisy

Trendy: Max, Aiden, Ethan, Isabella, Avery, Chloe

Traditional: William, Nate/Nathan, Andrew, Allison, Emily, Elizabeth

If Jake is a nickname for Jacob, you could also want to go more Biblical:  Noah, Levi, Caleb, Ruth, Hannah

Any of these on the right track?

Well, I see below you're considering Alexandra and Taylor for a girl.

Jacob/Jake was so popular for a while, that I can imagine most any name working with it, but here are a few ideas based on your girls' thoughts and Jacob/Jake.

Nicholas/Nick

Jeremy

Ethan

Andrew/Drew

Logan

Zachary

I'd also second the suggestion of Joshua.

Girls

Samantha

Jessica

Madison

Emily

Victoria