or sonny, sonnikin, subs. (common).An affectionate or familiar address: with no necessary reference to age or relationship. Also (nautical) SONNIWAX or SONNYWAX.
1542. UDALL, The Apophthegmes of Erasmus, 233. This word παιδίον, SONNEKIN, or litle sonne, tripped a little in his tongue.
1896. A. B. PATERSON, The Man from Snowy River and Other Verses, Old Pardon the Son of Reprieve, 10. Well, well, dont get angry, my SONNY.