अणुभाष्य (महाप्रभु वल्लभाचार्य - शुद्धाद्वैत वेदान्त ब्रह्मसूत्र महाभाष्य प्रकाश टीका सहित)

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Yes, it is 'व्या'!
And the next letter: 'स' with 'ौ' = 'सौ'.
So it is "व्यासौ युक्तिरुक्ता"!
Wait, why "व्यासौ"? In Sanskrit, could it be "व्यासौ" as a typo for "व्यासैः" (ai-matra looks like au-matra)?
Yes! In old Devanagari typography, the double matra at top for 'ai' (ै) plus a 'kāna' (ा) makes 'ौ' (au). If the compositor mistakenly put a kāna before the double matra, 'ै' became 'ौ'! So 'व्यासैः' or 'व्यासै' became 'व्यासौ'!
It is printed as: "व्यासौ".

Wait, let's check line 19 again:
कौषीतकिब्राह्मणे 'हिता नाम पुंसस्त नाड्य'
Wait, let's look at 'पुंसस्त':
Is that 'पुंसस्त'?
Look at the word:
प + ु + ं + स + स + त?
Let's look at:
'पु'
'ंस' (sa with anusvara)
'स्त' (sta)
Yes, it is printed as "पुंसस्त" or "पुंसस्ता"?
Wait, is there an aa-matra?
No, it's "पुंसस्त नाड्य".
Wait, could it be "पुंसस्त नाड