Orion, officially the Municipality of Orion,, is a 2nd class municipality in the province of Bataan, Philippines. According to the 2020 census, it has …Orion, officially the Municipality of Orion,, is a 2nd class municipality in the province of Bataan, Philippines. According to the 2020 census, it has a population of 60,771 people. The town of Orion has various etymologies. One theory suggests that the town was initially called "Udyong," derived from the words "lu-ad" and "uryong," meaning muddy or swampy. Another popular story states that during the Spanish colonial period, a group of soldiers passing through the area asked locals for the name of the place. Mistaking the question, the residents responded with "uod yon," which referred to a worm on the ground. The soldiers assumed it to be the name of the town and left, murmuring "uod, uod yon." Eventually, the town came to be known as Udyong, which was later changed to Orion.