For 'somebody' kelken is also attested, but considered acrolectal by informants (see Carayol et al. (1984–1995: 248N)).
For 'something', enn afer/ en zafer seems to be more frequent than keksoz: in the Cellier (1982) corpus there are 15 occurrences of keksoz/kekchoz and 46 of enn afer. It seems possible that kekchoz is more acrolectal.
Source: Staudacher-Valliamée 2004: 76
Source: Staudacher-Valliamée 2004: 76