French and English: from a medieval personal name (Latin
Constans, genitive Constantis, meaning ‘steadfast’,
‘faithful’, present participle of the verb constare ‘stand
fast’, ‘be consistent’). This was borne by an 8th-century Irish
martyr. This surname has also absorbed some cases of surnames based on
Constantius, a derivative of Constans, borne by a
2nd-century martyr, bishop of Perugia. Compare Constantine.
English: perhaps also a nickname from Old French constant
‘steadfast’, ‘faithful’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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