Some well-regarded yarn brands include: Lion Brand, Red Heart, Bernat, Patons, Knit Picks, Malabrigo, Noro, Cascade, Scheepjes, Debbie Bliss, Madeline Tosh, Rowan, Ice, Plymouth. 

1. Lion Brand Yarn, as one of the oldest American yarn brands, Lion Brand offers a diverse array of yarns suitable for various projects and budgets. Their popular lines include Homespun, Vanna's Choice, and Wool-Ease.
2. Red Heart Yarn is another popular brand that offers a wide range of yarns, including acrylics, cottons, and blends. They are especially well-known for their Super Saver yarn, which is a durable and versatile yarn that comes in a wide range of colors.
3. Bernat Yarn is a popular brand of yarn known for its high quality and wide range of products. It is a part of the Yarnspirations family of brands, which is owned by Spinrite, a leading North American craft yarn manufacturer. Bernat Yarn has been in the market for many years and has become a go-to choice for knitters and crocheters of all skill levels. They offer a range of textures and colors, as well as specialty yarns such as Bernat Blanket Yarn and Bernat Pop!
4. Knit Picks is an online retailer offering a variety of affordable and high-quality yarns. They carry a wide range of fibers, including wool, cotton, alpaca, and more, in a variety of weights and colors.
5. Patons Yarn is a UK-based brand known for its classic wool and wool-blend yarns. They offer a range of weights and textures, as well as a variety of colors and patterns.
6. Cascade Yarns is a US-based brand known for its high-quality wool and wool-blend yarns. They offer a range of textures and colors, as well as specialty yarns such as Eco Cloud, which is made froma blend of undyed alpaca and merino wool.
7. Malabrigo Yarn is an Uruguayan brand known for its hand-dyed, luxury yarns. They offer a range of fibers, including merino wool, silk, and alpaca, in a range of colors that are inspired by the natural beauty of Uruguay.
8. Berroco, a US-based company with a long history, known for their quality yarns and innovative blends like Ultra Alpaca and Vintage.
9. Noro Yarn is a Japanese brand known for its vibrant, self-striping yarns that are made from natural fibers such as wool, silk, and cashmere. Their yarns are known for their unique colorways and texture.
10. Debbie Bliss Yarn is a UK-based brand known for its luxury yarns, including cashmere, silk, and merino wool. They offer a range of weights and textures, as well as a variety of colors and patterns.
11. Scheepjes is a Dutch brand with a rich history dating back to the 18th century. They offer a wide variety of yarns, including cotton, acrylic, and wool blends, in an extensive range of colors.
12. Madeline Tosh is known for their hand-dyed yarns with rich, vibrant colors and high-quality fibers. Their yarns are often praised for their unique colorways and softness.
13. Rowan is a British yarn brand that offers a selection of high-quality yarns in various weights and fibers. They are known for their classic and elegant designs, often featuring natural fibers like wool, cotton, and silk.
14. Ice Yarns is owned by the Turkish company GSC Tekstil, which has been in the textile industry since 1984. They export their products to many countries around the world and have become well-known for their affordable, high-quality yarns, including acrylic, wool, cotton, bamboo, and various blends. They also have many different textures, such as eyelash, boucle, chenille, and more. This makes them a versatile option for knitters and crocheters looking for the perfect yarn for their projects.
15. Plymouth Yarn is a well-regarded brand in the knitting and crochet community, known for its wide range of high-quality yarns and innovative designs. The company was founded in 1964 by Richard K. Grossman and is based in Bristol, Pennsylvania, USA. Plymouth Yarn offers an extensive range of yarn types, including natural fibers like wool, cotton, alpaca, silk, and cashmere, as well as synthetic fibers like acrylic and nylon.