A WOMAN whose biological father was a sperm donor has tracked down 40 siblings with the same dad.

Kianni Arroyo, 21, from Florida, is now sharing her meetings with her siblings online.

4 Kianni was born using a sperm donor and has discovered she has 40 siblings scattered across the globe Credit: Kianni Arroyo

Kianni first began the project five years ago and has since discovered her siblings include four sets of twins as well as brothers and sisters as far afield as Australia, New Zealand and Canada.

The 21-year-old is the oldest known sibling born to the donor, with the youngest just five months old.

The young woman was raised by her mum – who she says has always been honest with her about being born using a sperm donor.

Kianni, a waitress, told Metro US: “I always wanted to find out more about who I was, and whether I had any siblings, so as soon as I was old enough to access the records I did just that.”

4 Kianni pictured with half siblings Joanna, Maggie and Meredith Credit: Kianni Arroyo

Since she began her search, Kianni discovered a local half-sister called Joanna, 20, who also lives in Florida.

Now, the girls have become good friends and see each other bimonthly.

Kianni added: “Even though we’ve never met before, having a father in common gives us a really special link, and means we feel comfortable with one another.”

She has also met her donor dad, who prefers to remain anonymous, and she describes him as a “really cool guy.”

4 Kianni's siblings Madison, seven, and twins Gracie and Elijah, three Credit: Kianni Arroyo

4 Kianni pictured with two half sisters Sophia and Ava Credit: Kianni Arroyo

In the US, sperm donors are only supposed to provide between 15 and 20 samples but, in Kianni’s dad’s case, the company was taken over in a buyout.

Their records were consequently wiped - meaning he was able to donate again.

Some families who already had one child by him also requested another sample, so their kids could be “full-siblings”.

Kianni is marrying her partner Ryan, 21, later this year and hopes the two can visit some of her half-siblings.

Around 30 of the 40 half siblings that Kianni has found have said they would like to meet her and she now hopes to make contact with them in the near future.

To follow Kianni’s journey as she meets her siblings, visit her Instagram @donor_siblings.

GMB features dad-of-29 Ari Nagel who donates his sperm in cups in Starbucks to save clients money on fertility clinics