Yes and no.
There is no proof that leprechauns even exist.
No, leprechauns are fictional.
There are not any people that have seen leprechauns. Leprechauns are fictional characters. Leprechauns are fictional characters that are from Ireland. Many people relate them to Saint Patrick's Day.
Saint Patrick is real, but leprechauns are not real.
Barny O'Gill and the little people.
Leprechauns are part of Irish mythology and have never featured in any native American culture. There is therefore no word for leprechaun in any native American language.
Leprechauns have magic, but leprechauns aren't real (As far as we know...)
There are no leprechauns except in stories.
Leprechauns are fictional characters.
There are no such things as leprechauns.
No. Leprechauns do not exist.
A human can keep the leprechauns gold if they answer the leprechauns three riddles.