trans!albus potter headcanon: when albus is like five or so, he comes up to harry and says, timidly, ‘daddy, i think i’m a boy’ and harry goes into supportive parent mode and just automatically says ‘that’s great son’ and they hug and then albus asks, ‘can you give me a new name, daddy?’ because albus knows all of their names come from his father and mother’s loved ones and he thinks it’s important to keep that going.

but harry’s just freaking out mentally because damn, he wasted sirius by using it as a middle name for james but he doesn’t want to tell his son to wait until he’s slept on it for his name so he just blurts out ‘albus severus’ and for a second, he’s mentally cursing because that is a terrible name but albus loves it! he kisses harry on the cheek and immediately tells everyone his great new name so it just sticks.