שלום וברכה!
[כ"ג תמוז, תש"כ]
... ועיין פס"ד כ"ק אדמו"ר הצ"צ (שו"ת אה"ע סקמ"ג, ועד"ז בפס"ד שלו ליו"ד סקט"ז) שבנדו"ד אין מקום לחשש כלל וכלל ששם החתן וחמיו שוין.
נדפסה בלקו"ש חכ"ד ע' 460.
Shalom u'Vrachah!
...And see the ruling of the tzt"z (Shut Even HaEzer section 143, and similarly in his ruling to Yoreh Deah section 116) that in our case there is absolutely no reason for concern when the chatan and his father-in-law share the same name.
This was printed in Likkutei Sichos volume 24, page 460.
Summary
The Rebbe writes that there is no halachic concern if a chatan and his father-in-law have identical names, as clarified by the tzt"z's responsa.