'mistakenly-given' is a compound word formed from 'mistakenly' and 'given'. 'Mistakenly' originates from 'mistake', which comes from Old Norse 'mistaka', meaning 'to take in error'. 'Given' is the past participle of 'give', which comes from Old English 'giefan', meaning 'to bestow or deliver'.

'Mistakenly' evolved from the Old Norse 'mistaka', while 'given' evolved from the Old English 'giefan'. The combination of these words into 'mistakenly-given' is a modern English formation.

The meaning of 'mistakenly-given' has remained consistent, referring to something provided in error.