Pixie, pizkie, piskie, and pigsie are indeed alternative names for mythical creatures known as pixies. These creatures are typically depicted as small, mischievous, and magical beings that inhabit the countryside, forests, and gardens. They are known for their playful nature and ability to shape-shift.

It is true that some scholars believe that the word "pixie" may have originated from a Swedish word for tiny fairy. However, the origins of the term remain uncertain, and it could be influenced by various cultural and linguistic sources.

Pixies Playing

Origin of Pixie

As you mentioned, pixies are strongly associated with Cornwall, England, where stories of these creatures can be traced back to the region's rich folklore. Some theories suggest that the names may have Celtic origins, linking them to the Irish and Scottish Aos Sí, which are supernatural beings that are often described as fairies or spirits.   (See definition below)

The Aos Sí are believed to inhabit an otherworldly realm, and they are often associated with various natural features, such as hills, forests, and bodies of water. They are considered powerful beings that can both help and hinder humans, depending on how they are treated. In this sense, there are some similarities between the Cornish pixies and the Aos Sí of Irish and Scottish folklore, as both are magical beings that can be mischievous and helpful.

Overall, while the precise origins of the names for pixies remain unclear, it is evident that these creatures have been an essential part of the folklore and mythology of various cultures. The connections between pixies and the Aos Sí further highlight the shared themes and motifs that can be found in the mythologies of different regions.

A Pixie

In some places, they are sometimes confused with Fairies and Sprites but they should not be confused.  In this picture you can see the similarities. The Pixie is considered a creatures of the woods or meadows.  A Sprite is a creature of the water.  They are sometimes referred to as Water Sprites.  A Fairy on the other hand is not as nice though similar.

Like Pixies, Fairies are often associated with mischief and trickery, as they enjoy playing pranks on unsuspecting humans. However, they can also be benevolent, offering guidance or assistance to those in need. In some cultures, it is believed that leaving offerings for Pixies, such as food or small trinkets, can help to secure their favor and protection.

Despite the similarities between pixies and fairies, they are usually considered distinct beings within folklore. Pixies are often smaller than fairies, and their magical powers are typically more limited. Additionally, while fairies are often described as having wings, pixies may or may not possess this feature.

Do you want to see a Pixie?
Take a walk along England’s beautiful southern coast and you may be charmed by more than just pretty wildflowers, mystical stone rings, and the blue, blue ocean. Pixies also roam the countryside, and if you happen to have a pretty scrap of ribbon or a clever verse of poetry for them, they might just invite you to join in with one of their giddy dances or send you along your way with a blessing over your head.

What Is A Pixie?

Traditional folklore says they are magical and  like tiny little kids that like to get together in groups so as to dance and wrestle all night long. They are small enough to fit in your hand or sit on a mushroom.

A poem by  Samuel Minturn Peck:

‘Tis said their forms are tiny, 
     yetAll human ills they can subdue,
Or with a wand or amulet
     Can win a maiden’s heart for you;
And many a blessing know to stew
     To make to wedlock bright;
Give honour to the dainty crew,
     The Pixies are abroad tonight.

Pixie Day

There is a town, Ottery St. Mary, in the county of Devon in England.  This county is sometimes refereed to as Devonshire in history and folklore.

In this town they celebrate Pixie Day, from an old legend.  This is the day Pixies were kicked out of town and sent to "Pixie's Parlor".  "Pixie's Parlor"  is the name given to the local caves.

In the legend, a town Bishop decided to put bells from Wales in the local church.  The Pixies decided this would be disastrous, so they put a spell on the road leading to town.  They set it up so the Monks bringing the bell would be diverted to a cliff.  As one Monk was about to go over the cliff, he shouted "Bless My Soul" and the spell was partially broken. 

The spell however allows that one day a year in June, the Pixies can capture the Bell ringers and put them in Jail in the "Parlor".  For this event the town erected a "Parlor" jail in the town square. They can only be rescued by the local Vicar.  The legend is reenacted by the local Cub and Boy Scouts.

Aos Si Definition........      (https://en.wikipedia.org/wiki/Aos_Sí)
The aos sí is the Irish term for a supernatural race in Irish mythology and Scottish mythology comparable to the pixies or fairies or elves. They are said to live underground.