κἄνkán

and (or even) if

Greek (New Testament) · G2579

Meanings

1. and if: Mark 16:18, Luke 12:38, John 8:55, 1 Corinthians 13:2, 1 Corinthians 13:3, James 5:15; with ellips., Luke 13:9.

2. Concessive, even if: Matthew 21:21, Matthew 26:35, John 8:14, John 10:38, John 11:25, Hebrews 12:20.

3. As intensive of simple καί, even, at least: Mark 5:28, Mark 6:56, Acts 5:15, 2 Corinthians 11:16.

Same root

καίkaí · G2532and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words
ἐάνeán · G1437a conditional particle; in case that, provided, etc.; often used in connection with other particles to denote indefiniteness or uncertainty

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.