“Minne’s themes are protection, love, luck, devotion and unity. Her symbols are the linden tree, cups, and beer. Minne is a German Goddess of love and fertility. Her name – meaning ‘remembrance’ – was applied to a special cup for lovers in this part of the world. The cup was filled with specially prepared beer and raised between two people wishing to deepen their love. This gives Minne a strong association with devotion, unit and fidelity.
During the second weekend in July, people in Geisenheim, Germany, celebrate Lindenfest by gathering around an ancient linden tree (six hundred-plus years old) and celebrate the year’s new wine. All aspects of the festival take place beneath the linden’s branches, which in magic terms represent safety and good fortune. The linden flowers portray Minne’s spirit, having been used in all manner of love magic! To protect a relationship, two lovers should carry dried linden flowers with them always.
When making a promise to each other, a couple may drink a wooden goblet of beer today, linking their destinies. Raise the glass to the sky first saying, ‘Minne’s love upon our lips, devotion in each sip.’
Drink while looking deeply into each other’s eyes. Or, exchange pieces of linden wood as a magical bonding that invokes Minne’s blessing. If linden isn’t native to your area, other trees and bushes that promote Minne’s loving qualities include avens, elm, lemon, orange, peach, primrose, rose and willow.”
(Patricia Telesco, “365 Goddess: a daily guide to the magic and inspiration of the goddess”.)
I really couldn’t find anything on the Goddess Minne. I thought I had found a reference in the glossary of The Elder Edda of Saemund Sigfusson, “MUNINN, mind; memory, recollection; G. minne, love” , but upon further research, Muninn turned out to be one in a pair of ravens who, along with Huginn (‘thought’), flew all over the world and brought the god Odin information. 
I found Minne defined as “An ancient Pagan Goddess who is said to have granted women and men permission to engage in lovemaking. Her name was a synonym for ‘love’, and She was often called Lofn (‘Goddess of Love’). In medieval times, Minne (like Melusine) was worshipped as a mermaid tailed Aphrodite by followers known as Minnesinger and Minstrels.” 
Researching the mermaid aspect, I found this description, “Literally Virgin of the Sea, the mermaid was an image of fish-tailed Aphrodite, the medieval Minne, Maerin, Mari, or Marina. Her Death-Goddess aspect, sometimes named Rán, received the souls of those put to sea in funeral boats.” 
While researching Her mermaid aspect, I ran across this information and thought was pretty interesting: “The legends of mermaids may have evolved from snake Goddesses such as the ones found at Knossos in Crete, the largest of the Greek islands. Thousands of years ago, the snake was sacred for its ability to transform in the shedding of its skin and to explore the light of day and the darkness of the earth. The mermaid is a fish-tailed Aphrodite, the Goddess of Love who represents the power of creativity inspired by love. She brings visions to the surface and inspires dreams and desires. She is able to move from the receptive watery depths to the focus of firm land.”  I never really thought about the snake/scale/mermaid connection before, but it makes sense.
Back to the reference to Lofn, Patricia Monaghan tells us that Lofn, “the Scandinavian Goddess of love had a special purpose: She was charged with smoothing over love’s difficulties. Lofn (‘mild’) received prayers of those separated from their lovers and was empowered to bring together those She favored” (p. 198).
I also found that “Lofn (pronounced LAW-ven) is the Norse Goddess of forbidden love. She is one of Frigg’s handmaidens, and serves Frigg (who is the Goddess of marriage) by removing the obstacles that lovers face. She also presides over the marriage of the two that She has brought together. Lofn’s name, which means ‘praise,’ is also seen as Lofna, Lofe, and Lofua.” 
This all seems a little scattered to me, though I can make some connections. Minne is a Germanic/Norse Goddess of love. Aphrodite was also a Goddess of love associated with the ocean. Considering how the Wave Maidens came to be identified with mermaids in Norse mythology, I certainly don’t see any issues preventing the identification of Minne with mermaids either.
Iliana’s Faery Realm, “Celtic, Roman, Greek, Norse, & Other Goddesses of Europe: Minne“.
Like a Cat Jewelry and Crafts, “Mermaid-Small“.
Monaghan, Patricia. The New Book of Goddesses and Heroines, “Lofn”.
Moore, Mary Ann. Flying Mermaid Studio, “circles, workshops & retreats; flying mermaids writing circles & retreats“.
Sabrina. Goddess A Day, “Lofn“.
Wikipedia, “Huginn and Muninn“.
Chalquist, Craig. Terrapsych.com, “Glossary of Norse and German Mythology – Lofn“.
Paxson, Diana L. Hrafnar.org, “Beloved“.