Zosan
Zosan is the ship name for Zoro and Sanji from One Piece. It is a portmanteau: built by joining a piece of one name to a piece of the other.
Engine version 1.0 · Breakdown computed from the live checker · Research Desk
Structure
The checker cannot resolve the ending of this name against Zoro and Sanji. That is the right answer rather than a failure: built by joining a piece of one name to a piece of the other.
Why this name is shaped the way it is
Zo plus san. Compact and symmetrical, and typical of how anime fandoms build names from the first syllable of each.
What our own engine would have built
Handed Zoro and Sanji with no knowledge of the fandom, the blender proposes Zornji, Sanro, Zonji, Sanjro, Zorji, Saro. Zosan is not among them. That is the normal result, and it is the clearest illustration of why this site refuses to call any candidate the best one. A community picked Zosan for reasons no software can see.
If you want to run the same check on a name of your own, the draft checker does exactly what produced the breakdown above, and the ship name generator builds candidates from two names you supply.
Other portmanteaus
Questions
What does Zosan mean?
Zosan is the ship name for Zoro and Sanji from One Piece. A ship name is a nickname for a pairing, and shipping means wanting two characters to be together.
Who is Zosan?
Zosan is not a person. It refers to Zoro and Sanji as a pairing, which is how fandom communities talk about two characters together in one word.
How was Zosan formed?
Not by blending the two names. Built by joining a piece of one name to a piece of the other. That is why a name checker cannot trace it back to Zoro and Sanji.