The true name of a dragonborn is not a simple matter to address. In fictional worlds that feature the concept of dragonborns, such as Dungeons & Dragons or Elder Scrolls, these beings are typically characterized by certain traits rather than by a specific individual.

In Elder Scrolls, a dragonborn is a rare person who has the soul and blood of a dragon, which grants them abilities such as speaking in the dragon language and absorbing the souls of defeated dragons. However, the name of a dragonborn character is left to the discretion of the player when creating their character.
In the case of Dungeons & Dragons, a dragonborn is a humanoid creature with dragon-like features, such as scales, a tail, and a breath weapon. As with Elder Scrolls, the player selects the name of their dragonborn character. However, in some fictional works, the concept of a dragonborn may be connected with a specific person who may or may not have a name.
In Game of Thrones, for example, one of the primary characters, Daenerys Targaryen, is referred to as the “Mother of Dragons” and is believed to be a dragonborn due to her close relationship with these creatures. In this scenario, the character has a name, but it is unclear if she is indeed a dragonborn or not. In other stories, the concept of a dragonborn may be connected with a specific myth or legend instead of a particular character with a name.
As a result, it is difficult to provide a definitive response to the question of a dragonborn’s real name without specifying which fictional universe or narrative is under consideration. In most cases, dragonborns are defined by their traits rather than their names, whereas in some other situations, the identity of a dragonborn may be intentionally vague or open to interpretation.