Correct spelling for the English word "Sompne" is [sˈɒmpnɪ], [sˈɒmpnɪ], [s_ˈɒ_m_p_n_ɪ] (IPA phonetic alphabet).
The word sompne is derived from the Old French word sommoner, which ultimately traces back to the Latin word summonere. In Old French, sommoner referred to a court official responsible for delivering summonses or notices to appear before a court. Over time, the spelling and pronunciation of the word evolved, leading to the modern English term sompne.