Origin of and
Related Words for and so forththus
Word Origin for and
Old English and, ond, originally meaning "thereupon, next," from Proto-Germanic *unda (cf. Old Saxon endi, Old Frisian anda, Middle Dutch ende, Old High German enti, German und, Old Norse enn), from PIE *en; cognate with Latin ante, Greek anti (see ante). Phrase and how as an exclamation of emphatic agreement dates from early 1900s.
and so forth
Also, and so on. And more of the same, also, and others. For example, At the mall, we shopped, had lunch, shopped some more, and so forth, or She planned to buy an entire outfit in blue—dress, shoes, hat, and so on. The first term dates from the late 1500s, the variant from the early 1700s. Also see and the like.