No, Couchbase is more or less a merge of Membase and Couchdb. With Couchdb it only shares its lineage and its creator; apart from that they are entirely different beasts.
It also shares more than half its name. The recognisable bit. The other bit is the generic and largely interchangeable "base" / "db". I don't know if it's intentional, but there's no wonder people get them confused.