A lot of people merged under one pseudonym?
Merge. Combine or cause to combine to form a single entity. Incorporate, affiliate, integrate, intermix, conglomerate.
To combine or join together, or to cause things to do this. “They decided to merge the two companies into one”.
Integrated, joined or combine. If one thing merges with another, or is merged with another, they combine.
“They voted to merge the two branch offices into a single unit”. To join things together. A statutory combination of two or more corporations.