grandboyn.
/ˈɡran(d)bɔɪ/, U.S. /ˈɡræn(d)ˌbɔɪ/ chiefly U.S. regional and colloquial.
A male grandchild; = grandson n.; cf. grandgirl n.
ΘΚΠ
society > society and the community > kinship or relationship > kinsman or relation > grandchild > [noun] > grandson
neveeOE
daughter sonOE
nephewc1325
nepotea1525
little son1570
grandson1573
neposa1600
petty-son1611
grandboy1837
1837 R. M. Bird Nick of Woods III. iii. 58 The red abregynes war the rale children of Sattan, and niggurs only the grand-boys.
1878 Herald & Torch Light (Hagerstown, Maryland) 21 Aug. As she couldn't see to read well, she got her grandboy, Jakie, to peruse it for her.
1909 Independent (N.Y.) 3 June 1229/1 As he was the only grandchild in my family, and the only grandboy in his father's, he was a wonderful bit of humanity.
1988 W. Berry Remembering iii. 55 I've got two grandboys.
2012 Salina (Kansas) Jrnl. 1 July (Life section) b1/5 They [sc. the children] call and send videos of my grandboys.
This is a new entry (OED Third Edition, December 2015; most recently modified version published online March 2022).
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n.1837