come by vs come into

come by and come into both are verbs.

Word	Noun	Adjective	Verb	Adverb
come by	No	No	Yes	No
come into	No	No	Yes	No

As verbs, come by and come into are synonyms defined as:

come by (verb)	come into (verb)
obtain, especially accidentally	obtain, especially accidentally
visit informally and spontaneously