Analysis of information sources in references of the Wikipedia article "Montgomery County, Maryland" in English language version.
County of Montgomery
Resolved, That after the first day of October next, such part of the said county of Frederick as is contained within the bounds and limits following, to wit : beginning at the east side of the mouth of Rock creek on Potowmac river, and running with the said river to the mouth of Monocacy, then with a straight line to Par's spring, from thence with the lines of the county to the beginning, shall be and is hereby erected into a new county by the name of Montgomery county.
I'm hoping to answer you and our Silver Spring questioner, who was looking for something this weekend in MoCo.
"Garde" (pronounced gard-uh) or "Gardez" (pronounced garday) means "watch", in the sense of "look out" or "on guard". "Bien" (pronounced bee-ann) means "good" to give the overall meaning of "Watch Well".
Resolved, That after the first day of October next, such part of the said county of Frederick as is contained within the bounds and limits following, to wit : beginning at the east side of the mouth of Rock creek on Potowmac river, and running with the said river to the mouth of Monocacy, then with a straight line to Par's spring, from thence with the lines of the county to the beginning, shall be and is hereby erected into a new county by the name of Montgomery county.
Resolved, That after the first day of October next, such part of the said county of Frederick as is contained within the bounds and limits following, to wit : beginning at the east side of the mouth of Rock creek on Potowmac river, and running with the said river to the mouth of Monocacy, then with a straight line to Par's spring, from thence with the lines of the county to the beginning, shall be and is hereby erected into a new county by the name of Montgomery county.
Gardez Bien, adopted in 1976 as the county motto, means to guard well or take good care
Resolved, That after the first day of October next, such part of the said county of Frederick as is contained within the bounds and limits following, to wit : beginning at the east side of the mouth of Rock creek on Potowmac river, and running with the said river to the mouth of Monocacy, then with a straight line to Par's spring, from thence with the lines of the county to the beginning, shall be and is hereby erected into a new county by the name of Montgomery county.
County of Montgomery
"Garde" (pronounced gard-uh) or "Gardez" (pronounced garday) means "watch", in the sense of "look out" or "on guard". "Bien" (pronounced bee-ann) means "good" to give the overall meaning of "Watch Well".
Gardez Bien, adopted in 1976 as the county motto, means to guard well or take good care
Resolved, That after the first day of October next, such part of the said county of Frederick as is contained within the bounds and limits following, to wit : beginning at the east side of the mouth of Rock creek on Potowmac river, and running with the said river to the mouth of Monocacy, then with a straight line to Par's spring, from thence with the lines of the county to the beginning, shall be and is hereby erected into a new county by the name of Montgomery county.