Awesome here is the info for both of those!
FTDNA kit: 211002
Ysearch User ID: ZJ2GW
Got it. You're definitely the subclade nicknamed I2a-Dinaric-North, or I2a-Din-N for short. In the current Nordtvedt nomenclature, you're L621+, L147+, giving you the full hierarchical subclade "I2a1b1a." See
Nordtvedt's tree and map. ISOGG doesn't recognize L147 and have a different tree structure than Nordtvedt, so in their system, you're "I2a1b3." Others, like FTDNA, don't recognize the common I2a SNP L460, and are therefore likely to call you "I2a2" or something similar. You'll notice that the FTDNA Project has you under the heading "I2a2a-M423-Din-N in ISOGG tree, I2a2 in FTDNA tree." That is basically right, although they have the ISOGG nomenclature out-of-date.
I2a-Din-N is probably over 2000 years old, but less than 3000 years old. It is descended from older Haplogroup I clades, which have been in Europe since the
Paleolithic. It is the older of the two I2a-Din branches, with the other, I2a-Din-S, being notable for its extremely high frequency in the Balkans (see
this thread). I2a-Din-N probably originated in Ukraine, and appears to have a close connection to Slavic migrations historically (although that doesn't necessarily mean that I2a-Din-N is exclusively Slavic). Being typically Slavic, it is
not common in Lithuania, reaching frequencies of no more than 5% or so. Compare to Russia (~10%), Ukraine (~20%), Belarus (~17%), etc... although it is also quite common in some non-Slavic areas, like Romania.
It could have gotten to Lithuania a number of ways, and unfortunately, it may be difficult to place when, exactly, it arrived.