Let’s just clarify this a little.
Meredith is the #434 most common female first name
0.033% of females in the US are named Meredith.
Around 40425 US females are named Meredith!

Meridith is the #2776 most common female first name
0.002% of females in the US are named Meridith.
Around 2450 US females are named Meridith!

Merideth is the #3699 most common female first name
0.001% of females in the US are named Merideth.
Around 1225 US females are named Merideth!

That’s right, it’s the four hundred and thirty-fourth most common name. There are more than 40,000 American women with my name. Variants are exceedingly uncommon. So why does everybody get it wrong?! (Thanks to NameStatistics.com for the numbers.)