Correct spelling for the English word "Sikerly" is [sˈa͡ɪkəli], [sˈaɪkəli], [s_ˈaɪ_k_ə_l_i] (IPA phonetic alphabet).
The word "sikerly" is derived from the Middle English term "sikerli", which is an adverb form of the Old English word "sicor" (later "seker"), meaning "secure" or "safe". It can be traced back to the Old Norse word "sikr", which has the same meaning. Over time, "sikerly" developed into a variation of "sikerli" to reflect changes in pronunciation and spelling.