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human
[The Incredibles] Was it a coincidence that Mr. and Mrs. Incredible named their child Dash and then he developed superspeed? Did they know beforehand?

Title basically sums it up. Did Dash's parents know he would be a speedster, or was it just an extreme coincidence? With Jack-Jack it seems like it takes abit for powers to manifest, so whats up with the perfect name for their super fast son.
gpt
Well, technically his name is Dashiel, but to answer your question, maybe?

It's implied that powers manifest pretty early because Edna expects a baby to have powers, and Helen corrects her saying that he doesn't have any.

But we don't really know how early it happens.  Most people pick baby names before the kid is born, and since his name is Dashiel Robert Parr, he could have just been named after a relative.  But the expectation that a baby has powers may also imply that they could express them even in the womb, perhaps with a super speed fluttering that Helen might feel, in which they might have decided to go with that name.

But Jack-Jack and Violet don't have names that might suggest their abilities, so most likely it's just a coincidence.