An apron comes from misdivision of a napron.
This incorrect division can work in other ways. Other examples include newt (an ewte), nickname (a nekename, from an ekename), naught (from an aught), nuncle (archaic; from division of mine uncle as my nuncle, and an uncle as a nuncle. Similarly for archaic naunt), the adder snake (a nædder).
Some also include orange, but the N was dropped before the word entered English, in French une orenge from une norenge.
Daffodil comes from the earlier affodell, a variant of asphodel. It's thought the D comes from the Dutch de affodil.
This also happens with names, such as Ned (my Ned from mine Ed) and Nellie (my Nellie from mine Ellie).
Wikipedia has many more examples in several languages and gives other names for the process:
Rebracketing (also known as juncture loss, junctural metanalysis, false splitting, false separation, faulty separation, misdivision, or refactorization) is a common process in historical linguistics where a word originally derived from one source is broken down or bracketed into a different set of factors. It is a form of folk etymology, where the new factors may appear meaningful (e.g., hamburger taken to mean a burger with ham), or may seem to be the result of valid morphological processes.