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CC Madhya 9.30

kṛṣir bhū-vācakaḥ śabdo
ṇaś ca nirvṛti-vācakaḥ
tayor aikyaṁ paraṁ brahma
kṛṣṇa ity abhidhīyate
Synonyms: 
kṛṣiḥ — the verbal root kṛṣ; bhū — attractive existence; vācakaḥ — signifying; śabdaḥ — word; ṇaḥ — the syllable ṇa; ca — and; nirvṛti — spiritual pleasure; vācakaḥ — indicating; tayoḥ — of both; aikyam — amalgamation; param — supreme; brahma — Absolute Truth; kṛṣṇaḥ — Lord Kṛṣṇa; iti — thus; abhidhīyate — is called.
Translation: 
“ ‘The word “kṛṣ” is the attractive feature of the Lord’s existence, and “ṇa” means spiritual pleasure. When the verb “kṛṣ” is added to the affix “ṇa,” it becomes “Kṛṣṇa,” which indicates the Absolute Truth.’
Purport: 

This is a verse from the Mahābhārata (Udyoga-parva 71.4).