I found the town name "MAO" to be a curious one.
So...
Down the rabbit hole I went.
Once I got through all the Mao Zedong stuff I found this Wikipedia page.
MAO (hand) itself has Galician/Portuguese roots.
en.wikipedia.org
And then of course MAO is the capital of the province of VALVERDE, which is also Portuguese.
You should also research what is the complete name of Mao. If it was founded in colonial times, its complete name will include a saint or virgin from the Catholic church.
For many years people thougth that Moca was simply that named after the river. The documents from seversl centuries ago were discovered and it turns out the full name of Moca is Nuestra Señora del Rosario de Moca. The oldest church in the town is nsmed sfter Ntra Sra del Rosario.
Bonao = Santa Rosa de Bonao
La Vega = Concepción de la Vega
Montecristi = San Fernando de Montecristi
Puerto Plata = San Felipe de Puerto Plata
Samaná = Santa Bárbara de Samaná
Baní = Nuestra Señora de la Regla de Baní
Etc...
Other places aren't name after something religious, such as Boca Chica, but they were not founded in colonial times. During that time there was nothing in Boca Chica and, in fact, if you see a map of the island of 1785 (the official one created for the King of Spain), that area has the name Punta Magdalena or something like that.
Other places got their names in colonial times, but for some reason time has modified them. Such is the case with Isla Catalina which in the map mention in the previous paragraph it says Isla Santa Catalina.
There is the well known of Isla Saona, but Columbus gave it the name of Isla Sabona (after the Italian town with the same name.)
Lastly, some places were not founded in colonial times but have a saint in their official name, such as San Pedro de Macorís.But it's rare to have that and not be founded in colonial times, unlike San Francisco de Macorís which was founded and named in colonial times.
Most of the towns founded in the 1700's were done with Spanish families from the Canary Islands. This alsl included the refounding of several towns that were destroyed in 1606 with the Devastations such as Montecristi and Puerto Plata. Other towns were founded with a mixture of Spaniards from the Cansry Islands and people collected from the surrounding countryside, such as Neiba. Other places were founded back in the 1490's and 1500's, never destroyed durimg the devastations but received Spaniards from the Canary Islands as additions to the population they already had, such as Santiago and La Vega.
Towns in the Central Mountains such as Jarabacoa, Jánico, etc were all founded after Dessalines invasion in 1805 by people from La Vega, Santiago qand surrounding countrysides that fled to the mountains in order to avoid being assassinsted by the Haitian troops. They basically went into the mountains and didn't began to cone down until after the Reconquista and a few more many years later after the Restauración. Most of the founding families of those towns no longer live in the Dominican Republic as they all left for the United States during the 1970's and 1980's. Many of them are white and I have always suspected many of the authorities which tended to encourage emigration thought they were placed there by Trujillo when in fact they go back into colonial times.
At the time of the mass emigrations the "pasaportes machetes" were in vouge and through thatleft entire families from the DR. That was a type of immigration fraud as many people would simply change the photo for one of them (or of they looked similar to the original person for whom the passport was emitted) and once arriving usually at JFK, the US immigration officials found it hard to verify the persons were who the passport said they were and let them in. Another trick was if someone with a Dominican passport died, many times a similar looking brother would pretend to be him and thst way they got into the United States.