Love Echosmith and their hit song 'Cool Kids'? Well, vocalist Sydney Sierota is here to spill five things you might not know about herself or her three bandmates/brothers: Graham Sierota, Noah Sierota and Jamie Sierota.

For starters, you probably figured out that the four members of the band are siblings -- but do you know what their last name means? (Hint: It's a Polish word. Also, Sydney points out that it's a bit ironic.)

Want to know what other secrets this exclusive video holds? Well, we can't reveal everything ... but we can tell you this. Sydney also gives the lowdown on one of her fears, something from childhood the band still loves and one of their favorite types of cuisine.

Bonus: She even concludes the list by swinging on a rope, Tarzan-style! (Yep, you totally need to check out this video.)

See 5 Things You Didn't Know About Echosmith -- straight from Sydney herself! -- in the video above.

Plus: Watch Echosmith's 'Cool Kids' Video

More From Mix 103.9