Correct spelling for the English word "Soonly" is [sˈuːnli], [sˈuːnli], [s_ˈuː_n_l_i] (IPA phonetic alphabet).
"Soonly" is a term that is not widely recognized or used in English. It is considered a non-standard or non-standardized term, and its usage is relatively rare. As a result, it does not have a well-established etymology in the traditional sense.
However, one can assume that "soonly" is derived from the word "soon", which is an adverb used to indicate something happening in the near future. It is possible that "soonly" was created as an adverbial form of "soon" to emphasize a sense of imminence or immediacy.
It is worth noting that "soonly" is not accepted as a standard English word and would generally be considered incorrect usage. If you come across the term, it is likely used in informal contexts or created by individuals for specific purposes.