The Holy Spirit and Revelation 14:1

Revelation 14:1 states ([ESV translation](https://www.biblegateway.com/passage/?search=Revelation%2014%3A1&version=ESV)) : > Then I looked, and behold, on Mount Zion stood the Lamb, and with him 144,000 who had his name and his Father’s name written on their foreheads. Now, the non-trinitarians I know (binitarians) use this verse as evidence that the Spirit is not a distinct person to be worshipped, apart from the Father and Son. They say that if the Spirit were God, then His name would also be on the forehead of the believer (I don't exactly have sources for this since it is coming from people I know personally). This is one of the best arguments they have, and I have not encountered a good answer to it, however I still think the weight of evidence leans in favor of the Trinity. **My question**, to put it simply, according to Trinitarians why isn't the Spirit's name on the believer's forehead in Revelation 14:1?