At the height of fascist persecution of jews, Federigo Enriques penned some of his articles as Adriano Giovannini (reputedly coined from the names of his daughter Adriana and of his son Giovanni), as a device to circulate them. I was able to trace back to that pseudonym at least two papers: "Il pensiero di Galileo Galilei" and "L'errore nelle matematiche". As I understand it, that is to be considered a pseudonym used just in publications rather than a fully new name for real life, so I deemed the answer qualifying with regard to the question requirements.

Also, not being able to comment others' answers, I can add von Neumann as good example of the category depicted in Andreas' answer.

At the height of fascist persecution of Jews, Federigo Enriques penned some of his articles as Adriano Giovannini (reputedly coined from the names of his daughter Adriana and of his son Giovanni), as a device to circulate them. I was able to trace back to that pseudonym at least two papers: "Il pensiero di Galileo Galilei" and "L'errore nelle matematiche". As I understand it, that is to be considered a pseudonym used just in publications rather than a fully new name for real life, so I deemed the answer qualifying with regard to the question requirements.

Also, not being able to comment others' answers, I can add von Neumann as good example of the category depicted in Andreas' answer.

At the height of fascist persecution of jews, Federigo Enriques penned some of his articles as Adriano Giovannini (reputedly coined from the names of his daughter Adriana and of his son Giovanni), as a device to circulate them. I was able to trace back to that pseudonym at least two papers: "Il pensiero di Galileo Galilei" and "L'errore nelle matematiche". As I understand it, that is to be considered a pseudonym used just in publications rather than a fully new name for real life, so I deemed the answer qualifying with regard to the question requirements.

Also, not being able to comment others' answers:

• I can add von Neumann as good example of the category depicted in Andreas' answer.

• As an anecdotal gloss to the Germain/Le Blanc case, it seems that even a century later that would have been a wise move: apparently Renato Caccioppoli was not so confident in women's mathematical capabilities, and it is said that once he ended examining a brilliant student of him with "Signorina, nonostante lei sia una donna le devo mettere 30 e lode.", which runs like: "Miss, despite you being a woman, it seems like I will have to give you A+".

At the height of fascist persecution of jews, Federigo Enriques penned some of his articles as Adriano Giovannini (reputedly coined from the names of his daughter Adriana and of his son Giovanni), as a device to circulate them. I was able to trace back to that pseudonym at least two papers: "Il pensiero di Galileo Galilei" and "L'errore nelle matematiche". As I understand it, that is to be considered a pseudonym used just in publications rather than a fully new name for real life, so I deemed the answer qualifying with regard to the question requirements.

Also, not being able to comment others' answers, I can add von Neumann as good example of the category depicted in Andreas' answer.