ogar

>>> Traces of foreign origin can bee seen in several lexical items,
>>> such <ogar> "a boy".

>> In Romanian, ogar "(grey)hound;" cf. Serbian ogar, Hungarian agár
>> ['Oga:r]

> Some dictionaries mention the Modern Greek term <ago'rion>
> or even the Turkish word <ogul>.

There are probably two unrelated <ogar> words:
1) "boy"
NGr. agórion; MLat. agarrus "lower servant"
maybe related with
<ogul> Tur. "son", Kirg. "boy"
2) "hound"
Pol. ogar; Cz. ohar^;
maybe related with
S-Ch. Bulg. Alb. Tur. zagar;
MGr. zagaron;
and maybe with
Bask. zahur, txakur

P.A.