spoonerism

Formed from the surname Spooner plus the suffix -ism. It honors Reverend W. A. Spooner (1844–1930), an Oxford don said to habitually swap the initial sounds of nearby words.

The word simply took the don's tendency and turned it into a permanent label for the slip itself.

No related or cognate word is given in the facts beyond the suffix -ism, which marks it as a named phenomenon rather than a borrowed term.