Macario is used in the modern US, the Spanish form of the ancient Greek Makarios or Latinized Macarius, the name of several early saints. Accessible and worldly, Macario can lead to the friendly nickname Mac.

Macario

This undiscovered (by English speakers) Basque name would make a very attractive alternative to Madeleine. The Spanish canoeist Maialen Chourraut competed in the 2021 Olympic Games.

Maialen

Mailys

Malo, the name of an important sixth century Breton saint who founded St. Malo, the charming port town in Brittany -- is considered quite au courant in France right now, ranking firmly in the Top 100. 
 Saint Malo of Aleth, a patron saint of lost items, was consecrated the first Bishop of Aleth. He was also known as Maclou, Maclovius and, in Italian, Macuto.
Malo is worth thinking about as a highly unusual alternative to Milo.

Malo

Marwa literally means "white stone," but is the name of a mountain in Mecca, making it an important name among Muslims. It's also another name for marjoram.

Marwa

The single T version of Matias is, like Mateo, the Spanish variation of the Hebrew Biblical Matthias or Matthew, while the double T version as in Mattias and Matteo is usually Italian.

Matias

Mavis, another word for the song thrush, is also a relative of the Welsh word for strawberries, mefus. Mavis has something of a British World War II feel, a friend of Beryl and Doris, but it was quite popular in the U.S. a couple of decades earlier, peaking in the Roaring Twenties. With the renewed interest in names ending in 's' — and in bird names — Mavis could make a return, especially with the new interest in Maeve, and in fact, it reentered the US Top 1000 after a 50-year absence in 2016.
 
Some noted bearers of the name are R&B singer Mavis Staples, a member of the Staple Singers, Canadian writer Mavis Gallant and the feminist activist Mavis Leno.
 
Mavis Gary was the name of the Charlize Theron character in the film Young Adult. And — trivia tidbit — in her short-running eponymous sitcom, Whoopi Goldberg's character was named Mavis.

Mavis

Although often connected to the men's magazine title, Maxim is a chic and powerful name for a little boy. It's proving moderately popular too, having been in the Top 1000 in the US since the year 2000.

Maxim

Common in France, but could be confused with the feminine Maxine here. 

Maxime

With the ubiquitous Max heard at every playground across the country, international versions have been gaining traction in an attempt to provide a fresh avenue to the highly sought nickname. This Spanish iteration has been in the US Top 1000 for most of the 21st century. This is one of many <a href="https://nameberry.com/baby-names/161/spanish-names">Spanish baby names</a> with international power.

Maximo

With the success of all names Max, from Max itself to Maxwell to Maxfield to Maximilian, it's just possible that Maxine could be lured away from her mah-jongg game at the clubhouse and into the nursery. She's already been chosen by hip musician Nick Hexum for his daughter, sister to Echo.
 Maxine was a Top 100 name from 1915 to 1930, attached to such celebs at the time as actress Maxine Elliott and one of the singing Andrews Sisters, and now to Congresswoman Maxine Waters and Chinese-born writer Maxine Hong Kingston. Reentered the US Top 1000 after a two decade absence in 2016.

Maxine

Maxton is a new member of the ever-expanding Max clan of baby names, hitting the US Top 1000 for the first time in 2011. It joins newfangled Maxon and stylish cousin Paxton. Still, we prefer the more classic Maxwell, Maxfield, Maximus, or just plain Max.

Maxton

In France, Maël has been a runaway success of the 21st century. This is the French spelling of the Breton name Mael, from a British Celtic word for a prince or chieftain also found in Welsh names.

Maël

This feminine form of Maël has the distinctive "aelle" ending found in Brittany, and is highly popular in France.

Maëlle

Meander

Melor is the name of a Breton saint who in legend was also a prince, suggesting he was the son of a Cornish king (Mylor is the Cornish variation of the name). Melor was said to have a foot and hand made of silver,
 In addition, Melor is a historical oddity: a name composed of the initial letters of the words Marx, Engels, Lenin, October, and Revolution., created by Communist parents eager to reject traditional names for their children.

Melor

Melusine was a figure from early European folklore, associated with the water. Her legends are especially connected with the northern and western areas of France, as well as the Low Countries. She is also connected with the French Lusignan royal house which claimed to be descended from Melusine. This name makes a good choice for people looking for a feminine mythological name but want to steer clear of Greek and Arthurian mythology.

Melusine

This <a href="https://nameberry.com/popular-names">popular name</a> in various Slavic countries and in Italy holds considerable Continental appeal. It is the full name of Ukranian-born actress Mila Kunis, most noted for her award-winning role in the film Black Swan. Another actress bearing the name is Milena Govitch, of Law & Order.
 Milena is one of the top names in Poland.

Milena

Minerva is the long-neglected name of the Roman goddess of wisdom and invention, the arts and martial strength, one of the <a href="https://nameberry.com/list/325/mythological-baby-names-for-girls">mythology names for girls</a> that might appeal to adventurous feminist parents. With Juno and Jupiter, she made the Capitoline triad, whose worship was at the very center of Roman religion.
 
Minerva Pott is a character in Dickens's novel Pickwick Papers. In Harry Potter, Minerva McGonagall is a Witch and Deputy Headmistress of Hogswarts, and in the Artemis Fowl books, Minerva Paradizo is equally intellectual. There's also a series of kids' mystery books centering around a Minerva Clark.
 
Minerva was a Top 500 name through the early 1920s, last appearing on the list in 1973. It's well liked on Nameberry though—currently at Number 417. Nickname Minnie fits right in with the other currently stylish vintage nickname names. Curiously, though, actress Minnie Driver was not born Minerva, but Amelia.

Minerva

This name owes its present life to actress Sorvino. Mira and Mirra have an arty aura. 
 
Mira is a true cross-cultural choice, with the literal meaning of "look" in Spanish, a peaceful meaning in several Eastern European languages, a well-used name in Arabic cultures meaning queen-like or a female ruler, and a nature name in Sanksrit. In Greek, it means "fate, destiny". 
 
Mira can also be a short form of Miryam or Miranda.

Mira

Miraj's meaning of "ascent" is a reference to the ascension of the Prophet Muhammad into Heaven, making this a very important Muslim name. 

Miraj

Miran is one of many names derived from the Slavic root word mir meaning "peace, world". The feminine version is Mira.

Miran

Myron still has ways to go before sounding stylish again, but this Eastern European variation has a more contemporary look.

Miron

In the Ossianic poems, Morven is the name of Fingal's kingdom. This name, borne by young Scottish actress Morven Christie, has a darkly intriguing quality to it.

Less common M names